//-----------------------------------------------------------------------------
// name:     OSI Interface for Gurobi
// template: OSI Cplex Interface written by T. Achterberg
// author:   Stefan Vigerske
//           Humboldt University Berlin
// license:  this file may be freely distributed under the terms of EPL
// comments: please scan this file for '???' and 'TODO' and read the comments
//-----------------------------------------------------------------------------
// Copyright (C) 2009 Humboldt University Berlin and others.
// All Rights Reserved.


#include <iostream>
#include <cassert>
#include <string>
#include <numeric>

#include "CoinPragma.hpp"
#include "CoinError.hpp"

#include "OsiConfig.h"
#include "OsiGrbSolverInterface.hpp"
#include "OsiCuts.hpp"
#include "OsiRowCut.hpp"
#include "OsiColCut.hpp"
#include "CoinPackedMatrix.hpp"
#include "CoinWarmStartBasis.hpp"

extern "C" {
#include "gurobi_c.h"
}

/* A utility definition which allows for easy suppression of unused variable warnings from GCC.
*/
#ifndef UNUSED
#if defined(__GNUC__)
#define UNUSED __attribute__((unused))
#endif
#endif

//#define DEBUG 1

#ifdef DEBUG
#define debugMessage printf("line %4d: ", __LINE__) & printf
#else
#define debugMessage \
  if (false)         \
  printf
#endif

#define GUROBI_CALL(m, x)                                                            \
  do {                                                                               \
    int _retcode;                                                                    \
    if ((_retcode = (x)) != 0) {                                                     \
      char s[1001];                                                                  \
      if (OsiGrbSolverInterface::globalenv_) {                                       \
        sprintf(s, "Error <%d> from GUROBI function call: ", _retcode);              \
        strncat(s, GRBgeterrormsg(OsiGrbSolverInterface::globalenv_), 1000);         \
      } else                                                                         \
        sprintf(s, "Error <%d> from GUROBI function call (no license?).", _retcode); \
      debugMessage("%s:%d: %s", __FILE__, __LINE__, s);                              \
      throw CoinError(s, m, "OsiGrbSolverInterface", __FILE__, __LINE__);            \
    }                                                                                \
  } while (false)

template < bool >
struct CompileTimeAssert;
template <>
struct CompileTimeAssert< true > {
};

#if GRB_VERSION_MAJOR < 4
#define GRB_METHOD_DUAL GRB_LPMETHOD_DUAL
#define GRB_METHOD_PRIMAL GRB_LPMETHOD_PRIMAL
#define GRB_INT_PAR_METHOD GRB_INT_PAR_LPMETHOD
#endif

//#############################################################################
// A couple of helper functions
//#############################################################################

inline void freeCacheDouble(double *&ptr)
{
  if (ptr != NULL) {
    delete[] ptr;
    ptr = NULL;
  }
}

inline void freeCacheChar(char *&ptr)
{
  if (ptr != NULL) {
    delete[] ptr;
    ptr = NULL;
  }
}

inline void freeCacheMatrix(CoinPackedMatrix *&ptr)
{
  if (ptr != NULL) {
    delete ptr;
    ptr = NULL;
  }
}

void OsiGrbSolverInterface::switchToLP(void)
{
  debugMessage("OsiGrbSolverInterface::switchToLP()\n");

  if (probtypemip_) {
    GRBmodel *lp = getMutableLpPtr();
    int nc = getNumCols();

    char *contattr = new char[nc];
    CoinFillN(contattr, nc, 'C');

    GUROBI_CALL("switchToLP", GRBsetcharattrarray(lp, GRB_CHAR_ATTR_VTYPE, 0, nc, contattr));

    delete[] contattr;

    probtypemip_ = false;
  }
}

void OsiGrbSolverInterface::switchToMIP(void)
{
  debugMessage("OsiGrbSolverInterface::switchToMIP()\n");

  if (!probtypemip_) {
    GRBmodel *lp = getMutableLpPtr();
    int nc = getNumCols();

    assert(coltype_ != NULL);

    GUROBI_CALL("switchToMIP", GRBsetcharattrarray(lp, GRB_CHAR_ATTR_VTYPE, 0, nc, coltype_));

    probtypemip_ = true;
  }
}

void OsiGrbSolverInterface::resizeColSpace(int minsize)
{
  debugMessage("OsiGrbSolverInterface::resizeColSpace()\n");

  if (minsize > colspace_) {
    int newcolspace = 2 * colspace_;
    if (minsize > newcolspace)
      newcolspace = minsize;
    char *newcoltype = new char[newcolspace];

    if (coltype_ != NULL) {
      CoinDisjointCopyN(coltype_, colspace_, newcoltype);
      delete[] coltype_;
    }
    coltype_ = newcoltype;

    if (colmap_O2G != NULL) {
      int *newcolmap_O2G = new int[newcolspace];
      CoinDisjointCopyN(colmap_O2G, colspace_, newcolmap_O2G);
      delete[] colmap_O2G;
      colmap_O2G = newcolmap_O2G;
    }

    if (colmap_G2O != NULL) {
      int *newcolmap_G2O = new int[newcolspace + auxcolspace];
      CoinDisjointCopyN(colmap_G2O, colspace_ + auxcolspace, newcolmap_G2O);
      delete[] colmap_G2O;
      colmap_G2O = newcolmap_G2O;
    }

    colspace_ = newcolspace;
  }
  assert(minsize == 0 || coltype_ != NULL);
  assert(colspace_ >= minsize);
}

void OsiGrbSolverInterface::freeColSpace()
{
  debugMessage("OsiGrbSolverInterface::freeColSpace()\n");

  if (colspace_ > 0) {
    delete[] coltype_;
    delete[] colmap_O2G;
    delete[] colmap_G2O;
    coltype_ = NULL;
    colmap_O2G = NULL;
    colmap_G2O = NULL;
    colspace_ = 0;
    auxcolspace = 0;
  }
  assert(coltype_ == NULL);
  assert(colmap_O2G == NULL);
  assert(colmap_G2O == NULL);
}

void OsiGrbSolverInterface::resizeAuxColSpace(int minsize)
{
  debugMessage("OsiGrbSolverInterface::resizeAuxColSpace()\n");

  if (minsize > auxcolspace) {
    int newauxcolspace = 2 * auxcolspace;
    if (minsize > newauxcolspace)
      newauxcolspace = minsize;

    if (colmap_G2O != NULL) {
      int *newcolmap_G2O = new int[colspace_ + newauxcolspace];
      CoinDisjointCopyN(colmap_G2O, colspace_ + auxcolspace, newcolmap_G2O);
      delete[] colmap_G2O;
      colmap_G2O = newcolmap_G2O;
    }

    auxcolspace = newauxcolspace;
  }
}

/// resizes auxcolind vector to current number of rows and inits values to -1
void OsiGrbSolverInterface::resizeAuxColIndSpace()
{
  debugMessage("OsiGrbSolverInterface::resizeAuxColIndSpace()\n");

  int numrows = getNumRows();
  if (auxcolindspace < numrows) {
    int newspace = 2 * auxcolindspace;
    if (numrows > newspace)
      newspace = numrows;

    int *newauxcolind = new int[newspace];

    if (auxcolindspace > 0)
      CoinDisjointCopyN(auxcolind, auxcolindspace, newauxcolind);
    for (int i = auxcolindspace; i < newspace; ++i)
      newauxcolind[i] = -1;

    delete[] auxcolind;
    auxcolind = newauxcolind;
    auxcolindspace = newspace;
  }
}

//#############################################################################
// Solve methods
//#############################################################################

void OsiGrbSolverInterface::initialSolve()
{
  debugMessage("OsiGrbSolverInterface::initialSolve()\n");
  bool takeHint;
  OsiHintStrength strength;
  int prevalgorithm = -1;

  switchToLP();

  GRBmodel *lp = getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS);

  /* set whether dual or primal, if hint has been given */
  getHintParam(OsiDoDualInInitial, takeHint, strength);
  if (strength != OsiHintIgnore) {
    GUROBI_CALL("initialSolve", GRBgetintparam(GRBgetenv(lp), GRB_INT_PAR_METHOD, &prevalgorithm));
    GUROBI_CALL("initialSolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_METHOD, takeHint ? GRB_METHOD_DUAL : GRB_METHOD_PRIMAL));
  }

  /* set whether presolve or not */
  int presolve = GRB_PRESOLVE_AUTO;
  getHintParam(OsiDoPresolveInInitial, takeHint, strength);
  if (strength != OsiHintIgnore)
    presolve = takeHint ? GRB_PRESOLVE_AUTO : GRB_PRESOLVE_OFF;

  GUROBI_CALL("initialSolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_PRESOLVE, presolve));

  /* set whether output or not */
  GUROBI_CALL("initialSolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_OUTPUTFLAG, (messageHandler()->logLevel() > 0)));

  /* optimize */
  GUROBI_CALL("initialSolve", GRBoptimize(lp));

  /* reoptimize without presolve if status unclear */
  int stat;
  GUROBI_CALL("initialSolve", GRBgetintattr(lp, GRB_INT_ATTR_STATUS, &stat));

  if (stat == GRB_INF_OR_UNBD && presolve != GRB_PRESOLVE_OFF) {
    GUROBI_CALL("initialSolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_PRESOLVE, GRB_PRESOLVE_OFF));
    GUROBI_CALL("initialSolve", GRBoptimize(lp));
    GUROBI_CALL("initialSolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_PRESOLVE, presolve));
  }

  /* reset method parameter, if changed */
  if (prevalgorithm != -1)
    GUROBI_CALL("initialSolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_METHOD, prevalgorithm));
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::resolve()
{
  debugMessage("OsiGrbSolverInterface::resolve()\n");
  bool takeHint;
  OsiHintStrength strength;
  int prevalgorithm = -1;

  switchToLP();

  GRBmodel *lp = getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS);

  /* set whether primal or dual */
  getHintParam(OsiDoDualInResolve, takeHint, strength);
  if (strength != OsiHintIgnore) {
    GUROBI_CALL("resolve", GRBgetintparam(GRBgetenv(lp), GRB_INT_PAR_METHOD, &prevalgorithm));
    GUROBI_CALL("resolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_METHOD, takeHint ? GRB_METHOD_DUAL : GRB_METHOD_PRIMAL));
  }

  /* set whether presolve or not */
  int presolve = GRB_PRESOLVE_OFF;
  getHintParam(OsiDoPresolveInResolve, takeHint, strength);
  if (strength != OsiHintIgnore)
    presolve = takeHint ? GRB_PRESOLVE_AUTO : GRB_PRESOLVE_OFF;

  GUROBI_CALL("resolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_PRESOLVE, presolve));

  /* set whether output or not */
  GUROBI_CALL("resolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_OUTPUTFLAG, (messageHandler()->logLevel() > 0)));

  /* optimize */
  GUROBI_CALL("resolve", GRBoptimize(lp));

  /* reoptimize if status unclear */
  int stat;
  GUROBI_CALL("resolve", GRBgetintattr(lp, GRB_INT_ATTR_STATUS, &stat));

  if (stat == GRB_INF_OR_UNBD && presolve != GRB_PRESOLVE_OFF) {
    GUROBI_CALL("resolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_PRESOLVE, GRB_PRESOLVE_OFF));
    GUROBI_CALL("resolve", GRBoptimize(lp));
    GUROBI_CALL("resolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_PRESOLVE, presolve));
  }

  /* reset method parameter, if changed */
  if (prevalgorithm != -1)
    GUROBI_CALL("initialSolve", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_METHOD, prevalgorithm));
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::branchAndBound()
{
  debugMessage("OsiGrbSolverInterface::branchAndBound()\n");

  switchToMIP();

  if (colsol_ != NULL && domipstart) {
    int *discridx = new int[getNumIntegers()];
    double *discrval = new double[getNumIntegers()];

    int j = 0;
    for (int i = 0; i < getNumCols() && j < getNumIntegers(); ++i) {
      if (!isInteger(i) && !isBinary(i))
        continue;
      discridx[j] = i;
      discrval[j] = colsol_[i];
      ++j;
    }
    assert(j == getNumIntegers());

    GUROBI_CALL("branchAndBound", GRBsetdblattrlist(getMutableLpPtr(), GRB_DBL_ATTR_START, getNumIntegers(), discridx, discrval));

    delete[] discridx;
    delete[] discrval;
  }

  GRBmodel *lp = getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS);

  GUROBI_CALL("branchAndBound", GRBsetintparam(GRBgetenv(lp), GRB_INT_PAR_OUTPUTFLAG, (messageHandler()->logLevel() > 0)));

  GUROBI_CALL("branchAndBound", GRBoptimize(lp));
}

//#############################################################################
// Parameter related methods
//#############################################################################

bool OsiGrbSolverInterface::setIntParam(OsiIntParam key, int value)
{
  debugMessage("OsiGrbSolverInterface::setIntParam(%d, %d)\n", key, value);

  switch (key) {
  case OsiMaxNumIteration:
    if (GRBsetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_ITERATIONLIMIT, (double)value) != 0) {
      *messageHandler() << "Warning: Setting GUROBI iteration limit to" << value << "failed." << CoinMessageEol;
      if (OsiGrbSolverInterface::globalenv_)
        *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
      return false;
    }
    return true;

  case OsiMaxNumIterationHotStart:
    if (value >= 0) {
      hotStartMaxIteration_ = value;
      return true;
    }
    return false;

  case OsiNameDiscipline:
    if (value < 0 || value > 3)
      return false;
    nameDisc_ = value;
    return true;

  case OsiLastIntParam:
  default:
    return false;
  }
}

//-----------------------------------------------------------------------------

bool OsiGrbSolverInterface::setDblParam(OsiDblParam key, double value)
{
  debugMessage("OsiGrbSolverInterface::setDblParam(%d, %g)\n", key, value);

  switch (key) {
    // Gurobi does not have primal or dual objective limits
    //  	case OsiDualObjectiveLimit:
    //  		break;
    //  	case OsiPrimalObjectiveLimit:
    //  	  break;
  case OsiDualTolerance:
    if (GRBsetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_OPTIMALITYTOL, value) != 0) {
      *messageHandler() << "Warning: Setting GUROBI dual (i.e., optimality) tolerance to" << value << "failed." << CoinMessageEol;
      if (OsiGrbSolverInterface::globalenv_)
        *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
      return false;
    }
    return true;
  case OsiPrimalTolerance:
    if (GRBsetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_FEASIBILITYTOL, value) != 0) {
      *messageHandler() << "Warning: Setting GUROBI primal (i.e., feasiblity) tolerance to" << value << "failed." << CoinMessageEol;
      if (OsiGrbSolverInterface::globalenv_)
        *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
      return false;
    }
    return true;
  case OsiObjOffset:
    return OsiSolverInterface::setDblParam(key, value);
  case OsiLastDblParam:
  default:
    return false;
  }
}

//-----------------------------------------------------------------------------

bool OsiGrbSolverInterface::setStrParam(OsiStrParam key, const std::string &value)
{
  debugMessage("OsiGrbSolverInterface::setStrParam(%d, %s)\n", key, value.c_str());

  switch (key) {
  case OsiProbName:
    GUROBI_CALL("setStrParam", GRBsetstrattr(getLpPtr(), GRB_STR_ATTR_MODELNAME, const_cast< char * >(value.c_str())));
    return true;

  case OsiSolverName:
  case OsiLastStrParam:
  default:
    return false;
  }
}

// Set a hint parameter
bool OsiGrbSolverInterface::setHintParam(OsiHintParam key, bool yesNo, OsiHintStrength strength, void *otherInfo)
{
  debugMessage("OsiGrbSolverInterface::setHintParam(%d, %d)\n", key, yesNo);

  if (key == OsiDoScale) {
    GUROBI_CALL("setHintParam", GRBsetintparam(GRBgetenv(getMutableLpPtr()), GRB_INT_PAR_SCALEFLAG, yesNo));
    OsiSolverInterface::setHintParam(key, yesNo, strength, otherInfo);
    return true;
  }

  return OsiSolverInterface::setHintParam(key, yesNo, strength, otherInfo);
}

//-----------------------------------------------------------------------------

bool OsiGrbSolverInterface::getIntParam(OsiIntParam key, int &value) const
{
  debugMessage("OsiGrbSolverInterface::getIntParam(%d)\n", key);

  switch (key) {
  case OsiMaxNumIteration:
    double dblval;
    GUROBI_CALL("getIntParam", GRBupdatemodel(getMutableLpPtr()));
    GUROBI_CALL("getIntParam", GRBgetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_ITERATIONLIMIT, &dblval));
    value = (int)dblval;
    return true;

  case OsiMaxNumIterationHotStart:
    value = hotStartMaxIteration_;
    return true;

  case OsiNameDiscipline:
    value = nameDisc_;
    return true;

  case OsiLastIntParam:
  default:
    return false;
  }
}

//-----------------------------------------------------------------------------

bool OsiGrbSolverInterface::getDblParam(OsiDblParam key, double &value) const
{
  debugMessage("OsiGrbSolverInterface::getDblParam(%d)\n", key);

  GUROBI_CALL("getDblParam", GRBupdatemodel(getMutableLpPtr()));

  switch (key) {
    // Gurobi does not have primal or dual objective limits
    //    case OsiDualObjectiveLimit:
    //      break;
    //   	case OsiPrimalObjectiveLimit:
    //   	  break;
  case OsiDualTolerance:
    GUROBI_CALL("getDblParam", GRBgetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_OPTIMALITYTOL, &value));
    return true;
  case OsiPrimalTolerance:
    GUROBI_CALL("getDblParam", GRBgetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_FEASIBILITYTOL, &value));
    return true;
  case OsiObjOffset:
    return OsiSolverInterface::getDblParam(key, value);
  case OsiLastDblParam:
  default:
    return false;
  }
}

//-----------------------------------------------------------------------------

bool OsiGrbSolverInterface::getStrParam(OsiStrParam key, std::string &value) const
{
  debugMessage("OsiGrbSolverInterface::getStrParam(%d)\n", key);

  switch (key) {
  case OsiProbName: {
    char *name = NULL;
    GUROBI_CALL("getStrParam", GRBgetstrattr(getMutableLpPtr(), GRB_STR_ATTR_MODELNAME, &name));
    assert(name != NULL);
    value = name;
    return true;
  }

  case OsiSolverName:
    value = "gurobi";
    return true;

  case OsiLastStrParam:
  default:
    return false;
  }
}

// Get a hint parameter
bool OsiGrbSolverInterface::getHintParam(OsiHintParam key, bool &yesNo, OsiHintStrength &strength, void *&otherInformation) const
{
  debugMessage("OsiGrbSolverInterface::getHintParam[1](%d)\n", key);
  if (key == OsiDoScale) {
    OsiSolverInterface::getHintParam(key, yesNo, strength, otherInformation);
    GUROBI_CALL("getHintParam", GRBupdatemodel(getMutableLpPtr()));
    int value;
    GUROBI_CALL("getHintParam", GRBgetintparam(GRBgetenv(getMutableLpPtr()), GRB_INT_PAR_SCALEFLAG, &value));
    yesNo = value;
    return true;
  }

  return OsiSolverInterface::getHintParam(key, yesNo, strength, otherInformation);
}

// Get a hint parameter
bool OsiGrbSolverInterface::getHintParam(OsiHintParam key, bool &yesNo, OsiHintStrength &strength) const
{
  debugMessage("OsiGrbSolverInterface::getHintParam[2](%d)\n", key);
  if (key == OsiDoScale) {
    OsiSolverInterface::getHintParam(key, yesNo, strength);
    GUROBI_CALL("getHintParam", GRBupdatemodel(getMutableLpPtr()));
    int value;
    GUROBI_CALL("getHintParam", GRBgetintparam(GRBgetenv(getMutableLpPtr()), GRB_INT_PAR_SCALEFLAG, &value));
    yesNo = value;
    return true;
  }

  return OsiSolverInterface::getHintParam(key, yesNo, strength);
}

// Get a hint parameter
bool OsiGrbSolverInterface::getHintParam(OsiHintParam key, bool &yesNo) const
{
  debugMessage("OsiGrbSolverInterface::getHintParam[3](%d)\n", key);
  if (key == OsiDoScale) {
    OsiSolverInterface::getHintParam(key, yesNo);
    GUROBI_CALL("getHintParam", GRBupdatemodel(getMutableLpPtr()));
    int value;
    GUROBI_CALL("getHintParam", GRBgetintparam(GRBgetenv(getMutableLpPtr()), GRB_INT_PAR_SCALEFLAG, &value));
    yesNo = value;
    return true;
  }

  return OsiSolverInterface::getHintParam(key, yesNo);
}

//#############################################################################
// Methods returning info on how the solution process terminated
//#############################################################################

bool OsiGrbSolverInterface::isAbandoned() const
{
  debugMessage("OsiGrbSolverInterface::isAbandoned()\n");

  GUROBI_CALL("isAbandoned", GRBupdatemodel(getMutableLpPtr()));

  int stat;
  GUROBI_CALL("isAbandoned", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_STATUS, &stat));

  return (
    stat == GRB_LOADED || stat == GRB_NUMERIC || stat == GRB_INTERRUPTED);
}

bool OsiGrbSolverInterface::isProvenOptimal() const
{
  debugMessage("OsiGrbSolverInterface::isProvenOptimal()\n");

  GUROBI_CALL("isProvenOptimal", GRBupdatemodel(getMutableLpPtr()));

  int stat;
  GUROBI_CALL("isProvenOptimal", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_STATUS, &stat));

  return (stat == GRB_OPTIMAL);
}

bool OsiGrbSolverInterface::isProvenPrimalInfeasible() const
{
  debugMessage("OsiGrbSolverInterface::isProvenPrimalInfeasible()\n");

  GUROBI_CALL("isProvenPrimalInfeasible", GRBupdatemodel(getMutableLpPtr()));

  int stat;
  GUROBI_CALL("isProvenPrimalInfeasible", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_STATUS, &stat));

  return (stat == GRB_INFEASIBLE);
}

bool OsiGrbSolverInterface::isProvenDualInfeasible() const
{
  debugMessage("OsiGrbSolverInterface::isProvenDualInfeasible()\n");

  GUROBI_CALL("isProvenDualInfeasible", GRBupdatemodel(getMutableLpPtr()));

  int stat;
  GUROBI_CALL("isProvenDualInfeasible", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_STATUS, &stat));

  return (stat == GRB_UNBOUNDED);
}

bool OsiGrbSolverInterface::isPrimalObjectiveLimitReached() const
{
  debugMessage("OsiGrbSolverInterface::isPrimalObjectiveLimitReached()\n");

  return false;
}

bool OsiGrbSolverInterface::isDualObjectiveLimitReached() const
{
  debugMessage("OsiGrbSolverInterface::isDualObjectiveLimitReached()\n");

  return false;
}

bool OsiGrbSolverInterface::isIterationLimitReached() const
{
  debugMessage("OsiGrbSolverInterface::isIterationLimitReached()\n");

  GUROBI_CALL("isIterationLimitReached", GRBupdatemodel(getMutableLpPtr()));

  int stat;
  GUROBI_CALL("isIterationLimitReached", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_STATUS, &stat));

  return (stat == GRB_ITERATION_LIMIT);
}

//#############################################################################
// WarmStart related methods
//#############################################################################

CoinWarmStart *OsiGrbSolverInterface::getEmptyWarmStart() const
{
  return (dynamic_cast< CoinWarmStart * >(new CoinWarmStartBasis()));
}

#ifdef UNUSED
// below we assume that getBasisStatus uses the same values as the warm start enum, i.e. 0: free, 1: basic, 2: upper, 3: lower
static CompileTimeAssert< CoinWarmStartBasis::isFree == 0 > UNUSED change_In_Enum_CoinWarmStartBasis_Status_free_breaks_this_function;
static CompileTimeAssert< CoinWarmStartBasis::basic == 1 > UNUSED change_In_Enum_CoinWarmStartBasis_Status_basic_breaks_this_function;
static CompileTimeAssert< CoinWarmStartBasis::atUpperBound == 2 > UNUSED change_In_Enum_CoinWarmStartBasis_Status_upper_breaks_this_function;
static CompileTimeAssert< CoinWarmStartBasis::atLowerBound == 3 > UNUSED change_In_Enum_CoinWarmStartBasis_Status_lower_breaks_this_function;
#endif

CoinWarmStart *OsiGrbSolverInterface::getWarmStart() const
{
  debugMessage("OsiGrbSolverInterface::getWarmStart()\n");

  assert(!probtypemip_);

  if (!basisIsAvailable())
    return NULL;

  CoinWarmStartBasis *ws = NULL;
  int numcols = getNumCols();
  int numrows = getNumRows();
  int *cstat = new int[numcols];
  int *rstat = new int[numrows];
  int i;

#if 1
  getBasisStatus(cstat, rstat);

  ws = new CoinWarmStartBasis;
  ws->setSize(numcols, numrows);

  for (i = 0; i < numrows; ++i)
    ws->setArtifStatus(i, CoinWarmStartBasis::Status(rstat[i]));
  for (i = 0; i < numcols; ++i)
    ws->setStructStatus(i, CoinWarmStartBasis::Status(cstat[i]));

#else
  GUROBI_CALL("getWarmStart", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("getWarmStart", GRBgetintattrarray(getMutableLpPtr(), GRB_INT_ATTR_VBASIS, 0, numcols, cstat));
  GUROBI_CALL("getWarmStart", GRBgetintattrarray(getMutableLpPtr(), GRB_INT_ATTR_CBASIS, 0, numrows, rstat));

  ws = new CoinWarmStartBasis;
  ws->setSize(numcols, numrows);

  char sense;
  for (i = 0; i < numrows; ++i) {
    switch (rstat[i]) {
    case GRB_BASIC:
      ws->setArtifStatus(i, CoinWarmStartBasis::basic);
      break;
    case GRB_NONBASIC_LOWER:
    case GRB_NONBASIC_UPPER:
      GUROBI_CALL("getWarmStart", GRBgetcharattrelement(getMutableLpPtr(), GRB_CHAR_ATTR_SENSE, i, &sense));
      ws->setArtifStatus(i, (sense == '>' ? CoinWarmStartBasis::atUpperBound : CoinWarmStartBasis::atLowerBound));
      break;
    default: // unknown row status
      delete ws;
      delete[] rstat;
      delete[] cstat;
      return NULL;
    }
  }

  for (i = 0; i < numcols; ++i) {
    switch (cstat[i]) {
    case GRB_BASIC:
      ws->setStructStatus(i, CoinWarmStartBasis::basic);
      break;
    case GRB_NONBASIC_LOWER:
      ws->setStructStatus(i, CoinWarmStartBasis::atLowerBound);
      break;
    case GRB_NONBASIC_UPPER:
      ws->setStructStatus(i, CoinWarmStartBasis::atUpperBound);
      break;
    case GRB_SUPERBASIC:
      ws->setStructStatus(i, CoinWarmStartBasis::isFree);
      break;
    default: // unknown column status
      delete[] rstat;
      delete[] cstat;
      delete ws;
      return NULL;
    }
  }
#endif

  delete[] cstat;
  delete[] rstat;

  return ws;
}

//-----------------------------------------------------------------------------

bool OsiGrbSolverInterface::setWarmStart(const CoinWarmStart *warmstart)
{
  debugMessage("OsiGrbSolverInterface::setWarmStart(%p)\n", (void *)warmstart);

  const CoinWarmStartBasis *ws = dynamic_cast< const CoinWarmStartBasis * >(warmstart);
  int numcols, numrows, i, oi;
  int *stat;

  if (!ws)
    return false;

  numcols = ws->getNumStructural();
  numrows = ws->getNumArtificial();

  if (numcols != getNumCols() || numrows != getNumRows())
    return false;

  switchToLP();

  stat = new int[numcols + nauxcols > numrows ? numcols + nauxcols : numrows];
  for (i = 0; i < numrows; ++i) {
    switch (ws->getArtifStatus(i)) {
    case CoinWarmStartBasis::basic:
      stat[i] = GRB_BASIC;
      break;
    case CoinWarmStartBasis::atLowerBound:
    case CoinWarmStartBasis::atUpperBound:
      stat[i] = GRB_NONBASIC_LOWER;
      break;
    case CoinWarmStartBasis::isFree:
      stat[i] = GRB_SUPERBASIC;
      break;
    default: // unknown row status
      delete[] stat;
      return false;
    }
  }

  GUROBI_CALL("setWarmStart", GRBsetintattrarray(getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS), GRB_INT_ATTR_CBASIS, 0, numrows, stat));

  for (i = 0; i < numcols + nauxcols; ++i) {
    oi = colmap_G2O ? colmap_G2O[i] : i;
    if (oi >= 0) { /* normal variable */
      switch (ws->getStructStatus(oi)) {
      case CoinWarmStartBasis::basic:
        stat[i] = GRB_BASIC;
        break;
      case CoinWarmStartBasis::atLowerBound:
        stat[i] = GRB_NONBASIC_LOWER;
        break;
      case CoinWarmStartBasis::atUpperBound:
        stat[i] = GRB_NONBASIC_UPPER;
        break;
      case CoinWarmStartBasis::isFree:
        stat[i] = GRB_SUPERBASIC;
        break;
      default: // unknown col status
        delete[] stat;
        return false;
      }
    } else { /* auxiliary variable, derive status from status of corresponding ranged row */
      switch (ws->getArtifStatus(-oi - 1)) {
      case CoinWarmStartBasis::basic:
        stat[i] = GRB_BASIC;
        break;
      case CoinWarmStartBasis::atLowerBound:
        stat[i] = GRB_NONBASIC_LOWER;
        break;
      case CoinWarmStartBasis::atUpperBound:
        stat[i] = GRB_NONBASIC_UPPER;
        break;
      case CoinWarmStartBasis::isFree:
        stat[i] = GRB_SUPERBASIC;
        break;
      default: // unknown col status
        delete[] stat;
        return false;
      }
    }
  }

  GUROBI_CALL("setWarmStart", GRBsetintattrarray(getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS), GRB_INT_ATTR_VBASIS, 0, numcols + nauxcols, stat));

  delete[] stat;
  return true;
}

//#############################################################################
// Hotstart related methods (primarily used in strong branching)
//#############################################################################

void OsiGrbSolverInterface::markHotStart()
{
  debugMessage("OsiGrbSolverInterface::markHotStart()\n");

  int numcols, numrows;

  assert(!probtypemip_);

  numcols = getNumCols() + nauxcols;
  numrows = getNumRows();
  if (numcols > hotStartCStatSize_) {
    delete[] hotStartCStat_;
    hotStartCStatSize_ = static_cast< int >(1.2 * static_cast< double >(numcols + nauxcols)); // get some extra space for future hot starts
    hotStartCStat_ = new int[hotStartCStatSize_];
  }
  if (numrows > hotStartRStatSize_) {
    delete[] hotStartRStat_;
    hotStartRStatSize_ = static_cast< int >(1.2 * static_cast< double >(numrows)); // get some extra space for future hot starts
    hotStartRStat_ = new int[hotStartRStatSize_];
  }

  GUROBI_CALL("markHotStart", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("markHotStart", GRBgetintattrarray(getMutableLpPtr(), GRB_INT_ATTR_VBASIS, 0, numcols + nauxcols, hotStartCStat_));
  GUROBI_CALL("markHotStart", GRBgetintattrarray(getMutableLpPtr(), GRB_INT_ATTR_CBASIS, 0, numrows, hotStartRStat_));
}

void OsiGrbSolverInterface::solveFromHotStart()
{
  debugMessage("OsiGrbSolverInterface::solveFromHotStart()\n");

  double maxiter;

  switchToLP();

  assert(getNumCols() <= hotStartCStatSize_);
  assert(getNumRows() <= hotStartRStatSize_);

  GUROBI_CALL("solveFromHotStart", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("solveFromHotStart", GRBsetintattrarray(getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS), GRB_INT_ATTR_CBASIS, 0, getNumRows(), hotStartRStat_));
  GUROBI_CALL("solveFromHotStart", GRBsetintattrarray(getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS), GRB_INT_ATTR_VBASIS, 0, getNumCols() + nauxcols, hotStartCStat_));

  GUROBI_CALL("solveFromHotStart", GRBgetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_ITERATIONLIMIT, &maxiter));
  GUROBI_CALL("solveFromHotStart", GRBsetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_ITERATIONLIMIT, (double)hotStartMaxIteration_));

  resolve();

  GUROBI_CALL("solveFromHotStart", GRBsetdblparam(GRBgetenv(getMutableLpPtr()), GRB_DBL_PAR_ITERATIONLIMIT, maxiter));
}

void OsiGrbSolverInterface::unmarkHotStart()
{
  debugMessage("OsiGrbSolverInterface::unmarkHotStart()\n");

  // ??? be lazy with deallocating memory and do nothing here, deallocate memory in the destructor
}

//#############################################################################
// Problem information methods (original data)
//#############################################################################

//------------------------------------------------------------------
// Get number of rows, columns, elements, ...
//------------------------------------------------------------------
int OsiGrbSolverInterface::getNumCols() const
{
  debugMessage("OsiGrbSolverInterface::getNumCols()\n");

  int numcols;

  GUROBI_CALL("getNumCols", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("getNumCols", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_NUMVARS, &numcols));

  numcols -= nauxcols;

  return numcols;
}

int OsiGrbSolverInterface::getNumRows() const
{
  debugMessage("OsiGrbSolverInterface::getNumRows()\n");

  int numrows;

  GUROBI_CALL("getNumRows", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("getNumRows", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_NUMCONSTRS, &numrows));

  return numrows;
}

int OsiGrbSolverInterface::getNumElements() const
{
  debugMessage("OsiGrbSolverInterface::getNumElements()\n");

  int numnz;

  GUROBI_CALL("getNumElements", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("getNumElements", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_NUMNZS, &numnz));

  /* each auxiliary column contributes one nonzero element to exactly one row */
  numnz -= nauxcols;

  return numnz;
}

//------------------------------------------------------------------
// Get pointer to rim vectors
//------------------------------------------------------------------

const double *OsiGrbSolverInterface::getColLower() const
{
  debugMessage("OsiGrbSolverInterface::getColLower()\n");

  if (collower_ == NULL) {
    int ncols = getNumCols();
    if (ncols > 0) {
      collower_ = new double[ncols];
      GUROBI_CALL("getColLower", GRBupdatemodel(getMutableLpPtr()));

      if (nauxcols)
        GUROBI_CALL("getColLower", GRBgetdblattrlist(getMutableLpPtr(), GRB_DBL_ATTR_LB, ncols, colmap_O2G, collower_));
      else
        GUROBI_CALL("getColLower", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_LB, 0, ncols, collower_));
    }
  }

  return collower_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getColUpper() const
{
  debugMessage("OsiGrbSolverInterface::getColUpper()\n");

  if (colupper_ == NULL) {
    int ncols = getNumCols();
    if (ncols > 0) {
      colupper_ = new double[ncols];
      GUROBI_CALL("getColUpper", GRBupdatemodel(getMutableLpPtr()));

      if (nauxcols)
        GUROBI_CALL("getColUpper", GRBgetdblattrlist(getMutableLpPtr(), GRB_DBL_ATTR_UB, ncols, colmap_O2G, colupper_));
      else
        GUROBI_CALL("getColUpper", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_UB, 0, ncols, colupper_));
    }
  }

  return colupper_;
}

//------------------------------------------------------------------
const char *OsiGrbSolverInterface::getRowSense() const
{
  debugMessage("OsiGrbSolverInterface::getRowSense()\n");

  if (rowsense_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      rowsense_ = new char[nrows];
      GUROBI_CALL("getRowSense", GRBupdatemodel(getMutableLpPtr()));

      GUROBI_CALL("getRowSense", GRBgetcharattrarray(getMutableLpPtr(), GRB_CHAR_ATTR_SENSE, 0, nrows, rowsense_));

      for (int i = 0; i < nrows; ++i) {
        if (auxcolind && auxcolind[i] >= 0) {
          assert(rowsense_[i] == GRB_EQUAL);
          rowsense_[i] = 'R';
          continue;
        }
        switch (rowsense_[i]) {
        case GRB_LESS_EQUAL:
          rowsense_[i] = 'L';
          break;
        case GRB_GREATER_EQUAL:
          rowsense_[i] = 'G';
          break;
        case GRB_EQUAL:
          rowsense_[i] = 'E';
          break;
        }
      }
    }
  }

  return rowsense_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getRightHandSide() const
{
  debugMessage("OsiGrbSolverInterface::getRightHandSide()\n");

  if (rhs_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      rhs_ = new double[nrows];
      GUROBI_CALL("getRightHandSide", GRBupdatemodel(getMutableLpPtr()));

      GUROBI_CALL("getRightHandSide", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_RHS, 0, nrows, rhs_));

      /* for ranged rows, we give the rhs of the aux. variable used to represent the range of this row as row rhs */
      if (nauxcols)
        for (int i = 0; i < nrows; ++i)
          if (auxcolind[i] >= 0)
            GUROBI_CALL("getRightHandSide", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_UB, auxcolind[i], &rhs_[i]));
    }
  }

  return rhs_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getRowRange() const
{
  debugMessage("OsiGrbSolverInterface::getRowRange()\n");

  if (rowrange_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0)
      rowrange_ = CoinCopyOfArrayOrZero((double *)NULL, nrows);

    if (nauxcols) {
      double auxlb, auxub;
      for (int i = 0; i < nrows; ++i)
        if (auxcolind[i] >= 0) {
          GUROBI_CALL("getRowRange", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_LB, auxcolind[i], &auxlb));
          GUROBI_CALL("getRowRange", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_UB, auxcolind[i], &auxub));
          rowrange_[i] = auxub - auxlb;
        }
    }
  }

  return rowrange_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getRowLower() const
{
  debugMessage("OsiGrbSolverInterface::getRowLower()\n");

  if (rowlower_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      const char *rowsense = getRowSense();

      rowlower_ = new double[nrows];

      double rhs;
      double dum1;
      for (int i = 0; i < nrows; ++i) {
        if (auxcolind && auxcolind[i] >= 0) {
          assert(rowsense[i] == 'R');
          GUROBI_CALL("getRowLower", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_LB, auxcolind[i], &rowlower_[i]));
        } else {
          GUROBI_CALL("getRowLower", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_RHS, i, &rhs));
          convertSenseToBound(rowsense[i], rhs, 0.0, rowlower_[i], dum1);
        }
      }
    }
  }

  return rowlower_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getRowUpper() const
{
  debugMessage("OsiGrbSolverInterface::getRowUpper()\n");

  if (rowupper_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      const char *rowsense = getRowSense();

      rowupper_ = new double[nrows];

      double rhs;
      double dum1;
      for (int i = 0; i < nrows; ++i) {
        if (auxcolind && auxcolind[i] >= 0) {
          assert(rowsense[i] == 'R');
          GUROBI_CALL("getRowUpper", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_UB, auxcolind[i], &rowupper_[i]));
        } else {
          GUROBI_CALL("getRowUpper", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_RHS, i, &rhs));
          convertSenseToBound(rowsense[i], rhs, 0.0, dum1, rowupper_[i]);
        }
      }
    }
  }

  return rowupper_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getObjCoefficients() const
{
  debugMessage("OsiGrbSolverInterface::getObjCoefficients()\n");

  if (obj_ == NULL) {
    int ncols = getNumCols();
    if (ncols > 0) {
      obj_ = new double[ncols];
      GUROBI_CALL("getObjCoefficients", GRBupdatemodel(getMutableLpPtr()));

      if (nauxcols)
        GUROBI_CALL("getObjCoefficients", GRBgetdblattrlist(getMutableLpPtr(), GRB_DBL_ATTR_OBJ, ncols, colmap_O2G, obj_));
      else
        GUROBI_CALL("getObjCoefficients", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_OBJ, 0, ncols, obj_));
    }
  }

  return obj_;
}

//------------------------------------------------------------------
double OsiGrbSolverInterface::getObjSense() const
{
  debugMessage("OsiGrbSolverInterface::getObjSense()\n");

  int sense;
  GUROBI_CALL("getObjSense", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("getObjSense", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_MODELSENSE, &sense));

  return (double)sense;
}

//------------------------------------------------------------------
// Return information on integrality
//------------------------------------------------------------------

bool OsiGrbSolverInterface::isContinuous(int colNumber) const
{
  debugMessage("OsiGrbSolverInterface::isContinuous(%d)\n", colNumber);

  return getCtype()[colNumber] == 'C';
}

//------------------------------------------------------------------
// Row and column copies of the matrix ...
//------------------------------------------------------------------

const CoinPackedMatrix *OsiGrbSolverInterface::getMatrixByRow() const
{
  debugMessage("OsiGrbSolverInterface::getMatrixByRow()\n");

  if (matrixByRow_ == NULL) {
    int nrows = getNumRows();
    int ncols = getNumCols();

    if (nrows == 0) {
      matrixByRow_ = new CoinPackedMatrix();
      matrixByRow_->setDimensions(0, ncols);
      return matrixByRow_;
    }

    int nelems;
    int *starts = new int[nrows + 1];
    int *len = new int[nrows];

    GUROBI_CALL("getMatrixByRow", GRBupdatemodel(getMutableLpPtr()));

    GUROBI_CALL("getMatrixByRow", GRBgetconstrs(getMutableLpPtr(), &nelems, NULL, NULL, NULL, 0, nrows));

    assert(nelems == getNumElements() + nauxcols);
    int *indices = new int[nelems];
    double *elements = new double[nelems];

    GUROBI_CALL("getMatrixByRow", GRBgetconstrs(getMutableLpPtr(), &nelems, starts, indices, elements, 0, nrows));

    matrixByRow_ = new CoinPackedMatrix();

    // Should be able to pass null for length of packed matrix,
    // assignMatrix does not seem to allow (even though documentation say it is possible to do this).
    // For now compute the length.
    starts[nrows] = nelems;
    for (int i = 0; i < nrows; ++i)
      len[i] = starts[i + 1] - starts[i];

    matrixByRow_->assignMatrix(false /* not column ordered */,
      ncols + nauxcols, nrows, nelems,
      elements, indices, starts, len);

    if (nauxcols) {
      // delete auxiliary columns from matrix
      int *auxcols = new int[nauxcols];
      int j = 0;
      for (int i = 0; i < ncols + nauxcols; ++i)
        if (colmap_G2O[i] < 0)
          auxcols[j++] = i;
      assert(j == nauxcols);

      matrixByRow_->deleteCols(nauxcols, auxcols);

      delete[] auxcols;

      assert(matrixByRow_->getNumElements() == getNumElements());
      assert(matrixByRow_->getMinorDim() <= ncols);
    }
  }

  return matrixByRow_;
}

//------------------------------------------------------------------

const CoinPackedMatrix *OsiGrbSolverInterface::getMatrixByCol() const
{
  debugMessage("OsiGrbSolverInterface::getMatrixByCol()\n");

  if (matrixByCol_ == NULL) {
    int nrows = getNumRows();
    int ncols = getNumCols();

    matrixByCol_ = new CoinPackedMatrix();

    if (ncols > 0) {
      int nelems;
      int *starts = new int[ncols + nauxcols + 1];
      int *len = new int[ncols + nauxcols];

      GUROBI_CALL("getMatrixByCol", GRBupdatemodel(getMutableLpPtr()));

      GUROBI_CALL("getMatrixByCol", GRBgetvars(getMutableLpPtr(), &nelems, NULL, NULL, NULL, 0, ncols + nauxcols));

      int *indices = new int[nelems];
      double *elements = new double[nelems];

      GUROBI_CALL("getMatrixByCol", GRBgetvars(getMutableLpPtr(), &nelems, starts, indices, elements, 0, ncols + nauxcols));

      // Should be able to pass null for length of packed matrix,
      // assignMatrix does not seem to allow (even though documentation say it is possible to do this).
      // For now compute the length.
      starts[ncols + nauxcols] = nelems;
      for (int i = 0; i < ncols + nauxcols; i++)
        len[i] = starts[i + 1] - starts[i];

      matrixByCol_->assignMatrix(true /* column ordered */,
        nrows, ncols + nauxcols, nelems,
        elements, indices, starts, len);

      assert(matrixByCol_->getNumCols() == ncols + nauxcols);
      assert(matrixByCol_->getNumRows() == nrows);

      if (nauxcols) {
        // delete auxiliary columns from matrix
        int *auxcols = new int[nauxcols];
        int j = 0;
        for (int i = 0; i < ncols + nauxcols; ++i)
          if (colmap_G2O[i] < 0)
            auxcols[j++] = i;
        assert(j == nauxcols);

        matrixByCol_->deleteCols(nauxcols, auxcols);

        delete[] auxcols;

        assert(matrixByCol_->getNumElements() == getNumElements());
        assert(matrixByCol_->getMajorDim() <= ncols);
        assert(matrixByCol_->getMinorDim() <= nrows);
      }
    } else
      matrixByCol_->setDimensions(nrows, ncols);
  }

  return matrixByCol_;
}

//------------------------------------------------------------------
// Get solver's value for infinity
//------------------------------------------------------------------
double OsiGrbSolverInterface::getInfinity() const
{
  debugMessage("OsiGrbSolverInterface::getInfinity()\n");

  return GRB_INFINITY;
}

//#############################################################################
// Problem information methods (results)
//#############################################################################

// *FIXME*: what should be done if a certain vector doesn't exist???

const double *OsiGrbSolverInterface::getColSolution() const
{
  debugMessage("OsiGrbSolverInterface::getColSolution()\n");

  if (colsol_ == NULL) {
    int ncols = getNumCols();
    if (ncols > 0) {
      colsol_ = new double[ncols];

      GUROBI_CALL("getColSolution", GRBupdatemodel(getMutableLpPtr()));

      if (GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_X, 0, colsol_) == 0) { // if a solution is available, get it
        if (nauxcols)
          GUROBI_CALL("getColSolution", GRBgetdblattrlist(getMutableLpPtr(), GRB_DBL_ATTR_X, ncols, colmap_O2G, colsol_));
        else
          GUROBI_CALL("getColSolution", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_X, 0, ncols, colsol_));
      } else {
        *messageHandler() << "Warning: OsiGrbSolverInterface::getColSolution() called, but no solution available! Returning lower bounds, but they may be at -infinity. Be aware!" << CoinMessageEol;
        if (OsiGrbSolverInterface::globalenv_)
          *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
        if (nauxcols)
          GUROBI_CALL("getColSolution", GRBgetdblattrlist(getMutableLpPtr(), GRB_DBL_ATTR_LB, ncols, colmap_O2G, colsol_));
        else
          GUROBI_CALL("getColSolution", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_LB, 0, ncols, colsol_));
      }
    }
  }

  return colsol_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getRowPrice() const
{
  debugMessage("OsiGrbSolverInterface::getRowPrice()\n");

  if (rowsol_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      rowsol_ = new double[nrows];

      GUROBI_CALL("getRowPrice", GRBupdatemodel(getMutableLpPtr()));

      if (GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_PI, 0, rowsol_) == 0) {
        GUROBI_CALL("getRowPrice", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_PI, 0, nrows, rowsol_));
      } else {
        *messageHandler() << "Warning: OsiGrbSolverInterface::getRowPrice() called, but no solution available! Returning 0.0. Be aware!" << CoinMessageEol;
        if (OsiGrbSolverInterface::globalenv_)
          *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
        CoinZeroN(rowsol_, nrows);
      }

      //??? what is the dual value for a ranged row?
    }
  }

  return rowsol_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getReducedCost() const
{
  debugMessage("OsiGrbSolverInterface::getReducedCost()\n");

  if (redcost_ == NULL) {
    int ncols = getNumCols();
    if (ncols > 0) {
      redcost_ = new double[ncols];

      GUROBI_CALL("getReducedCost", GRBupdatemodel(getMutableLpPtr()));

      if (GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_RC, 0, redcost_) == 0) { // if reduced costs are available, get them
        if (nauxcols)
          GUROBI_CALL("getReducedCost", GRBgetdblattrlist(getMutableLpPtr(), GRB_DBL_ATTR_RC, ncols, colmap_O2G, redcost_));
        else
          GUROBI_CALL("getReducedCost", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_RC, 0, ncols, redcost_));
      } else {
        *messageHandler() << "Warning: OsiGrbSolverInterface::getReducedCost() called, but no solution available! Returning 0.0. Be aware!" << CoinMessageEol;
        if (OsiGrbSolverInterface::globalenv_)
          *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
        CoinZeroN(redcost_, ncols);
      }
    }
  }

  return redcost_;
}

//------------------------------------------------------------------
const double *OsiGrbSolverInterface::getRowActivity() const
{
  debugMessage("OsiGrbSolverInterface::getRowActivity()\n");

  if (rowact_ == NULL) {
    int nrows = getNumRows();
    if (nrows > 0) {
      rowact_ = new double[nrows];

      GUROBI_CALL("getRowActivity", GRBupdatemodel(getMutableLpPtr()));

      if (GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_SLACK, 0, rowact_) == 0) {
        GUROBI_CALL("getRowActivity", GRBgetdblattrarray(getMutableLpPtr(), GRB_DBL_ATTR_SLACK, 0, nrows, rowact_));

        for (int r = 0; r < nrows; ++r) {
          if (nauxcols && auxcolind[r] >= 0) {
            GUROBI_CALL("getRowActivity", GRBgetdblattrelement(getMutableLpPtr(), GRB_DBL_ATTR_X, auxcolind[r], &rowact_[r]));
          } else
            rowact_[r] = getRightHandSide()[r] - rowact_[r];
        }
      } else {
        *messageHandler() << "Warning: OsiGrbSolverInterface::getRowActivity() called, but no solution available! Returning 0.0. Be aware!" << CoinMessageEol;
        if (OsiGrbSolverInterface::globalenv_)
          *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
        CoinZeroN(rowact_, nrows);
      }
    }
  }
  return rowact_;
}

//------------------------------------------------------------------
double OsiGrbSolverInterface::getObjValue() const
{
  debugMessage("OsiGrbSolverInterface::getObjValue()\n");

  double objval = 0.0;

  GUROBI_CALL("getObjValue", GRBupdatemodel(getMutableLpPtr()));

  if (GRBgetdblattr(getMutableLpPtr(), GRB_DBL_ATTR_OBJVAL, &objval) == 0) {
    // Adjust objective function value by constant term in objective function
    double objOffset;
    getDblParam(OsiObjOffset, objOffset);
    objval = objval - objOffset;
  } else {
    *messageHandler() << "Warning: OsiGrbSolverInterface::getObjValue() called, but probably no solution available! Returning 0.0. Be aware!" << CoinMessageEol;
    if (OsiGrbSolverInterface::globalenv_)
      *messageHandler() << "\t GUROBI error message: " << GRBgeterrormsg(OsiGrbSolverInterface::globalenv_) << CoinMessageEol;
  }

  return objval;
}

//------------------------------------------------------------------
int OsiGrbSolverInterface::getIterationCount() const
{
  debugMessage("OsiGrbSolverInterface::getIterationCount()\n");

  double itercnt;

  GUROBI_CALL("getIterationCount", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("getIterationCount", GRBgetdblattr(getMutableLpPtr(), GRB_DBL_ATTR_ITERCOUNT, &itercnt));

  return (int)itercnt;
}

//------------------------------------------------------------------
std::vector< double * > OsiGrbSolverInterface::getDualRays(int maxNumRays,
  bool fullRay) const
{
  debugMessage("OsiGrbSolverInterface::getDualRays(%d,%s)\n", maxNumRays,
    fullRay ? "true" : "false");

  if (fullRay == true) {
    throw CoinError("Full dual rays not yet implemented.", "getDualRays",
      "OsiGrbSolverInterface");
  }

  OsiGrbSolverInterface solver(*this);

  const int numcols = getNumCols();
  const int numrows = getNumRows();
  int *index = new int[std::max(numcols, numrows)];
  int i;
  for (i = std::max(numcols, numrows) - 1; i >= 0; --i) {
    index[i] = i;
  }
  double *obj = new double[std::max(numcols, 2 * numrows)];
  CoinFillN(obj, numcols, 0.0);
  solver.setObjCoeffSet(index, index + numcols, obj);

  double *clb = new double[2 * numrows];
  double *cub = new double[2 * numrows];

  const double plusone = 1.0;
  const double minusone = -1.0;
  const char *sense = getRowSense();

  const CoinPackedVectorBase **cols = new const CoinPackedVectorBase *[numrows];
  int newcols = 0;
  for (i = 0; i < numrows; ++i) {
    switch (sense[i]) {
    case 'L':
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &minusone, false);
      break;
    case 'G':
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &plusone, false);
      break;
    case 'R':
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &minusone, false);
      cols[newcols++] = new CoinShallowPackedVector(1, &index[i], &plusone, false);
      break;
    case 'N':
    case 'E':
      break;
    }
  }

  CoinFillN(obj, newcols, 1.0);
  CoinFillN(clb, newcols, 0.0);
  CoinFillN(cub, newcols, getInfinity());

  solver.addCols(newcols, cols, clb, cub, obj);
  delete[] index;
  delete[] cols;
  delete[] clb;
  delete[] cub;
  delete[] obj;

  solver.setObjSense(1.0); // minimize
  solver.initialSolve();

  const double *solverpi = solver.getRowPrice();
  double *pi = new double[numrows];
  for (i = numrows - 1; i >= 0; --i) {
    pi[i] = -solverpi[i];
  }
  return std::vector< double * >(1, pi);
}

//------------------------------------------------------------------
std::vector< double * > OsiGrbSolverInterface::getPrimalRays(int maxNumRays) const
{
  debugMessage("OsiGrbSolverInterface::getPrimalRays(%d)\n", maxNumRays);

  return std::vector< double * >();
}

//#############################################################################
// Problem modifying methods (rim vectors)
//#############################################################################

void OsiGrbSolverInterface::setObjCoeff(int elementIndex, double elementValue)
{
  debugMessage("OsiGrbSolverInterface::setObjCoeff(%d, %g)\n", elementIndex, elementValue);

  GUROBI_CALL("setObjCoeff", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_OBJ, nauxcols ? colmap_O2G[elementIndex] : elementIndex, elementValue));

  if (obj_ != NULL)
    obj_[elementIndex] = elementValue;
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::setObjCoeffSet(const int *indexFirst,
  const int *indexLast,
  const double *coeffList)
{
  debugMessage("OsiGrbSolverInterface::setObjCoeffSet(%p, %p, %p)\n", (void *)indexFirst, (void *)indexLast, (void *)coeffList);

  const int cnt = (int)(indexLast - indexFirst);

  if (cnt == 0)
    return;
  if (cnt == 1) {
    setObjCoeff(*indexFirst, *coeffList);
    return;
  }
  assert(cnt > 1);

  if (nauxcols) {
    int *indices = new int[cnt];
    for (int i = 0; i < cnt; ++i)
      indices[i] = colmap_O2G[indexFirst[i]];
    GUROBI_CALL("setObjCoeffSet", GRBsetdblattrlist(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_OBJ, cnt, indices, const_cast< double * >(coeffList)));
    delete[] indices;
  } else {
    GUROBI_CALL("setObjCoeffSet", GRBsetdblattrlist(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_OBJ, cnt, const_cast< int * >(indexFirst), const_cast< double * >(coeffList)));
  }

  if (obj_ != NULL)
    for (int i = 0; i < cnt; ++i)
      obj_[indexFirst[i]] = coeffList[i];
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setColLower(int elementIndex, double elementValue)
{
  debugMessage("OsiGrbSolverInterface::setColLower(%d, %g)\n", elementIndex, elementValue);

  GUROBI_CALL("setColLower", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_LB, nauxcols ? colmap_O2G[elementIndex] : elementIndex, elementValue));

  if (collower_ != NULL)
    collower_[elementIndex] = elementValue;
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setColUpper(int elementIndex, double elementValue)
{
  debugMessage("OsiGrbSolverInterface::setColUpper(%d, %g)\n", elementIndex, elementValue);

  GUROBI_CALL("setColUpper", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_UB, nauxcols ? colmap_O2G[elementIndex] : elementIndex, elementValue));

  if (colupper_ != NULL)
    colupper_[elementIndex] = elementValue;
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setColBounds(int elementIndex, double lower, double upper)
{
  debugMessage("OsiGrbSolverInterface::setColBounds(%d, %g, %g)\n", elementIndex, lower, upper);

  setColLower(elementIndex, lower);
  setColUpper(elementIndex, upper);
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setColSetBounds(const int *indexFirst,
  const int *indexLast,
  const double *boundList)
{
  debugMessage("OsiGrbSolverInterface::setColSetBounds(%p, %p, %p)\n", (void *)indexFirst, (void *)indexLast, (void *)boundList);

  const int cnt = (int)(indexLast - indexFirst);
  if (cnt == 0)
    return;
  if (cnt == 1) {
    setColLower(*indexFirst, boundList[0]);
    setColUpper(*indexFirst, boundList[1]);
    return;
  }
  assert(cnt > 1);

  double *lbList = new double[cnt];
  double *ubList = new double[cnt];
  int *indices = nauxcols ? new int[cnt] : NULL;

  for (int i = 0; i < cnt; ++i) {
    lbList[i] = boundList[2 * i];
    ubList[i] = boundList[2 * i + 1];
    if (indices)
      indices[i] = colmap_O2G[indexFirst[i]];

    if (collower_ != NULL)
      collower_[indexFirst[i]] = boundList[2 * i];
    if (colupper_ != NULL)
      colupper_[indexFirst[i]] = boundList[2 * i + 1];
  }

  GUROBI_CALL("setColSetBounds", GRBsetdblattrlist(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_LB, cnt, indices ? indices : const_cast< int * >(indexFirst), lbList));
  GUROBI_CALL("setColSetBounds", GRBsetdblattrlist(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_UB, cnt, indices ? indices : const_cast< int * >(indexFirst), ubList));

  delete[] lbList;
  delete[] ubList;
  delete[] indices;
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setRowLower(int i, double elementValue)
{
  debugMessage("OsiGrbSolverInterface::setRowLower(%d, %g)\n", i, elementValue);

  double rhs = getRightHandSide()[i];
  double range = getRowRange()[i];
  char sense = getRowSense()[i];
  double lower = 0, upper = 0;

  convertSenseToBound(sense, rhs, range, lower, upper);
  if (lower != elementValue) {
    convertBoundToSense(elementValue, upper, sense, rhs, range);
    setRowType(i, sense, rhs, range);
  }
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setRowUpper(int i, double elementValue)
{
  debugMessage("OsiGrbSolverInterface::setRowUpper(%d, %g)\n", i, elementValue);

  double rhs = getRightHandSide()[i];
  double range = getRowRange()[i];
  char sense = getRowSense()[i];
  double lower = 0, upper = 0;

  convertSenseToBound(sense, rhs, range, lower, upper);
  if (upper != elementValue) {
    convertBoundToSense(lower, elementValue, sense, rhs, range);
    setRowType(i, sense, rhs, range);
  }
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setRowBounds(int elementIndex, double lower, double upper)
{
  debugMessage("OsiGrbSolverInterface::setRowBounds(%d, %g, %g)\n", elementIndex, lower, upper);

  double rhs, range;
  char sense;

  convertBoundToSense(lower, upper, sense, rhs, range);

  setRowType(elementIndex, sense, rhs, range);
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setRowType(int i, char sense, double rightHandSide, double range)
{
  debugMessage("OsiGrbSolverInterface::setRowType(%d, %c, %g, %g)\n", i, sense, rightHandSide, range);

  GUROBI_CALL("setRowType", GRBupdatemodel(getMutableLpPtr()));

  if (nauxcols && auxcolind[i] >= 0) { // so far, row i is a ranged row
    switch (sense) {
    case 'R':
      // row i was ranged row and remains a ranged row
      assert(range > 0);
      GUROBI_CALL("setRowType", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_LB, auxcolind[i], rightHandSide - range));
      GUROBI_CALL("setRowType", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_UB, auxcolind[i], rightHandSide));
      break;
    case 'N':
    case 'L':
    case 'G':
    case 'E':
      convertToNormalRow(i, sense, rightHandSide);
      break;
    default:
      std::cerr << "Unknown row sense: " << sense << std::endl;
      exit(-1);
    }
  } else if (sense == 'R') {
    convertToRangedRow(i, rightHandSide, range);
  } else {
    char grbsense;
    switch (sense) {
    case 'N':
      grbsense = GRB_LESS_EQUAL;
      rightHandSide = getInfinity();
      break;

    case 'L':
      grbsense = GRB_LESS_EQUAL;
      break;

    case 'G':
      grbsense = GRB_GREATER_EQUAL;
      break;

    case 'E':
      grbsense = GRB_EQUAL;
      break;

    default:
      std::cerr << "Unknown row sense: " << sense << std::endl;
      exit(-1);
    }
    GUROBI_CALL("setRowType", GRBsetcharattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_CHAR_ATTR_SENSE, i, grbsense));
    GUROBI_CALL("setRowType", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_RHS, i, rightHandSide));
  }

  if (rowsense_ != NULL)
    rowsense_[i] = sense;

  if (rhs_ != NULL)
    rhs_[i] = rightHandSide;

  if (rowlower_ != NULL || rowupper_ != NULL) {
    double dummy;
    convertSenseToBound(sense, rightHandSide, range,
      rowlower_ ? rowlower_[i] : dummy,
      rowupper_ ? rowupper_[i] : dummy);
  }
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setRowSetBounds(const int *indexFirst,
  const int *indexLast,
  const double *boundList)
{
  debugMessage("OsiGrbSolverInterface::setRowSetBounds(%p, %p, %p)\n", (void *)indexFirst, (void *)indexLast, (void *)boundList);

  const long int cnt = indexLast - indexFirst;
  if (cnt <= 0)
    return;

  char *sense = new char[cnt];
  double *rhs = new double[cnt];
  double *range = new double[cnt];
  for (int i = 0; i < cnt; ++i)
    convertBoundToSense(boundList[2 * i], boundList[2 * i + 1], sense[i], rhs[i], range[i]);
  setRowSetTypes(indexFirst, indexLast, sense, rhs, range);

  delete[] range;
  delete[] rhs;
  delete[] sense;
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setRowSetTypes(const int *indexFirst,
  const int *indexLast,
  const char *senseList,
  const double *rhsList,
  const double *rangeList)
{
  debugMessage("OsiGrbSolverInterface::setRowSetTypes(%p, %p, %p, %p, %p)\n",
    (void *)indexFirst, (void *)indexLast, (void *)senseList, (void *)rhsList, (void *)rangeList);

  const int cnt = (int)(indexLast - indexFirst);
  if (cnt == 0)
    return;
  if (cnt == 1) {
    setRowType(*indexFirst, *senseList, *rhsList, *rangeList);
    return;
  }
  assert(cnt > 0);

  GUROBI_CALL("setRowSetTypes", GRBupdatemodel(getMutableLpPtr()));

  char *grbsense = new char[cnt];
  double *rhs = new double[cnt];
  for (int i = 0; i < cnt; ++i) {
    rhs[i] = rhsList[i];
    if (nauxcols && auxcolind[indexFirst[i]] >= 0) { // so far, row is a ranged row
      switch (senseList[i]) {
      case 'R':
        // row i was ranged row and remains a ranged row
        assert(rangeList[i] > 0);
        GUROBI_CALL("setRowSetTypes", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_LB, auxcolind[indexFirst[i]], rhsList[i] - rangeList[i]));
        GUROBI_CALL("setRowSetTypes", GRBsetdblattrelement(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), GRB_DBL_ATTR_UB, auxcolind[indexFirst[i]], rhsList[i]));
        grbsense[i] = GRB_EQUAL;
        rhs[i] = 0.0;
        break;
      case 'N':
        convertToNormalRow(indexFirst[i], senseList[i], rhsList[i]);
        grbsense[i] = GRB_LESS_EQUAL;
        rhs[i] = getInfinity();
        break;
      case 'L':
        convertToNormalRow(indexFirst[i], senseList[i], rhsList[i]);
        grbsense[i] = GRB_LESS_EQUAL;
        break;
      case 'G':
        convertToNormalRow(indexFirst[i], senseList[i], rhsList[i]);
        grbsense[i] = GRB_GREATER_EQUAL;
        break;
      case 'E':
        convertToNormalRow(indexFirst[i], senseList[i], rhsList[i]);
        grbsense[i] = GRB_EQUAL;
        break;
      default:
        std::cerr << "Unknown row sense: " << senseList[i] << std::endl;
        exit(-1);
      }
    } else if (senseList[i] == 'R') {
      convertToRangedRow(indexFirst[i], rhsList[i], rangeList[i]);
      grbsense[i] = GRB_EQUAL;
      rhs[i] = 0.0;
    } else {
      switch (senseList[i]) {
      case 'N':
        grbsense[i] = GRB_LESS_EQUAL;
        rhs[i] = getInfinity();
        break;

      case 'L':
        grbsense[i] = GRB_LESS_EQUAL;
        break;

      case 'G':
        grbsense[i] = GRB_GREATER_EQUAL;
        break;

      case 'E':
        grbsense[i] = GRB_EQUAL;
        break;

      default:
        std::cerr << "Unknown row sense: " << senseList[i] << std::endl;
        exit(-1);
      }
    }

    if (rowsense_ != NULL)
      rowsense_[indexFirst[i]] = senseList[i];

    if (rhs_ != NULL)
      rhs_[indexFirst[i]] = senseList[i] == 'N' ? getInfinity() : rhsList[i];
  }

  GUROBI_CALL("setRowSetTypes", GRBsetcharattrlist(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), GRB_CHAR_ATTR_SENSE, cnt, const_cast< int * >(indexFirst), grbsense));
  GUROBI_CALL("setRowSetTypes", GRBsetdblattrlist(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), GRB_DBL_ATTR_RHS, cnt, const_cast< int * >(indexFirst), rhs));

  delete[] rhs;
  delete[] grbsense;
}

//#############################################################################
void OsiGrbSolverInterface::setContinuous(int index)
{
  debugMessage("OsiGrbSolverInterface::setContinuous(%d)\n", index);

  assert(coltype_ != NULL);
  assert(colspace_ >= getNumCols());

  coltype_[index] = GRB_CONTINUOUS;

  if (probtypemip_) {
    GUROBI_CALL("setContinuous", GRBupdatemodel(getMutableLpPtr()));
    GUROBI_CALL("setContinuous", GRBsetcharattrelement(getMutableLpPtr(), GRB_CHAR_ATTR_VTYPE, nauxcols ? colmap_O2G[index] : index, GRB_CONTINUOUS));
  }
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setInteger(int index)
{
  debugMessage("OsiGrbSolverInterface::setInteger(%d)\n", index);

  assert(coltype_ != NULL);
  assert(colspace_ >= getNumCols());

  if (getColLower()[index] == 0.0 && getColUpper()[index] == 1.0)
    coltype_[index] = GRB_BINARY;
  else
    coltype_[index] = GRB_INTEGER;

  if (probtypemip_) {
    GUROBI_CALL("setInteger", GRBupdatemodel(getMutableLpPtr()));
    GUROBI_CALL("setInteger", GRBsetcharattrelement(getMutableLpPtr(), GRB_CHAR_ATTR_VTYPE, nauxcols ? colmap_O2G[index] : index, coltype_[index]));
  }
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setContinuous(const int *indices, int len)
{
  debugMessage("OsiGrbSolverInterface::setContinuous(%p, %d)\n", (void *)indices, len);

  for (int i = 0; i < len; ++i)
    setContinuous(indices[i]);
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::setInteger(const int *indices, int len)
{
  debugMessage("OsiGrbSolverInterface::setInteger(%p, %d)\n", (void *)indices, len);

  for (int i = 0; i < len; ++i)
    setInteger(indices[i]);
}

//#############################################################################

void OsiGrbSolverInterface::setRowName(int ndx, std::string name)
{
  debugMessage("OsiGrbSolverInterface::setRowName\n");

  if (ndx < 0 || ndx >= getNumRows())
    return;

  int nameDiscipline;
  getIntParam(OsiNameDiscipline, nameDiscipline);
  if (nameDiscipline == 0)
    return;

  OsiSolverInterface::setRowName(ndx, name);

  GUROBI_CALL("setRowName", GRBsetstrattrelement(getLpPtr(), GRB_STR_ATTR_CONSTRNAME, ndx, const_cast< char * >(name.c_str())));
}

void OsiGrbSolverInterface::setColName(int ndx, std::string name)
{
  debugMessage("OsiGrbSolverInterface::setColName\n");

  if (ndx < 0 || ndx >= getNumCols())
    return;

  int nameDiscipline;
  getIntParam(OsiNameDiscipline, nameDiscipline);
  if (nameDiscipline == 0)
    return;

  OsiSolverInterface::setColName(ndx, name);

  GUROBI_CALL("setColName", GRBsetstrattrelement(getLpPtr(), GRB_STR_ATTR_VARNAME, nauxcols ? colmap_O2G[ndx] : ndx, const_cast< char * >(name.c_str())));
}

//#############################################################################

void OsiGrbSolverInterface::setObjSense(double s)
{
  debugMessage("OsiGrbSolverInterface::setObjSense(%g)\n", s);

  GUROBI_CALL("setObjSense", GRBsetintattr(getLpPtr(OsiGrbSolverInterface::FREECACHED_RESULTS), GRB_INT_ATTR_MODELSENSE, (int)s));
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::setColSolution(const double *cs)
{
  debugMessage("OsiGrbSolverInterface::setColSolution(%p)\n", (void *)cs);

  int nc = getNumCols();

  if (cs == NULL)
    freeCachedResults();
  else if (nc > 0) {
    // If colsol isn't allocated, then allocate it
    if (colsol_ == NULL)
      colsol_ = new double[nc];

    // Copy in new col solution.
    CoinDisjointCopyN(cs, nc, colsol_);

    //*messageHandler() << "OsiGrb::setColSolution: Gurobi does not allow setting the column solution. Command is ignored." << CoinMessageEol;
  }
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::setRowPrice(const double *rs)
{
  debugMessage("OsiGrbSolverInterface::setRowPrice(%p)\n", (void *)rs);

  int nr = getNumRows();

  if (rs == NULL)
    freeCachedResults();
  else if (nr > 0) {
    // If rowsol isn't allocated, then allocate it
    if (rowsol_ == NULL)
      rowsol_ = new double[nr];

    // Copy in new row solution.
    CoinDisjointCopyN(rs, nr, rowsol_);

    *messageHandler() << "OsiGrb::setRowPrice: Gurobi does not allow setting the row price. Command is ignored." << CoinMessageEol;
  }
}

//#############################################################################
// Problem modifying methods (matrix)
//#############################################################################
void OsiGrbSolverInterface::addCol(const CoinPackedVectorBase &vec,
  const double collb, const double colub,
  const double obj)
{
  debugMessage("OsiGrbSolverInterface::addCol(%p, %g, %g, %g)\n", (void *)&vec, collb, colub, obj);

  int nc = getNumCols();
  assert(colspace_ >= nc);

  resizeColSpace(nc + 1);
  coltype_[nc] = GRB_CONTINUOUS;

  GUROBI_CALL("addCol", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("addCol", GRBaddvar(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), vec.getNumElements(), const_cast< int * >(vec.getIndices()), const_cast< double * >(vec.getElements()), obj, collb, colub, coltype_[nc], NULL));

  if (nauxcols) {
    colmap_O2G[nc] = nc + nauxcols;
    colmap_G2O[nc + nauxcols] = nc;
  }
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::addCols(const int numcols,
  const CoinPackedVectorBase *const *cols,
  const double *collb, const double *colub,
  const double *obj)
{
  debugMessage("OsiGrbSolverInterface::addCols(%d, %p, %p, %p, %p)\n", numcols, (void *)cols, (void *)collb, (void *)colub, (void *)obj);

  int nc = getNumCols();
  assert(colspace_ >= nc);

  resizeColSpace(nc + numcols);
  CoinFillN(&coltype_[nc], numcols, GRB_CONTINUOUS);

  int i;
  int nz = 0;
  for (i = 0; i < numcols; ++i)
    nz += cols[i]->getNumElements();

  int *index = new int[nz];
  double *elem = new double[nz];
  int *start = new int[numcols + 1];

  nz = 0;
  start[0] = 0;
  for (i = 0; i < numcols; ++i) {
    const CoinPackedVectorBase *col = cols[i];
    const int len = col->getNumElements();
    CoinDisjointCopyN(col->getIndices(), len, index + nz);
    CoinDisjointCopyN(col->getElements(), len, elem + nz);
    nz += len;
    start[i + 1] = nz;
  }

  GUROBI_CALL("addCols", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("addCols", GRBaddvars(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), numcols, nz, start, index, elem, const_cast< double * >(obj), const_cast< double * >(collb), const_cast< double * >(colub), NULL, NULL));

  delete[] start;
  delete[] elem;
  delete[] index;

  if (nauxcols)
    for (i = 0; i < numcols; ++i) {
      colmap_O2G[nc + i] = nc + i + nauxcols;
      colmap_G2O[nc + i + nauxcols] = nc + i;
    }
}

static int intcompare(const void *p1, const void *p2)
{
  return (*(const int *)p1) - (*(const int *)p2);
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::deleteCols(const int num, const int *columnIndices)
{
  debugMessage("OsiGrbSolverInterface::deleteCols(%d, %p)\n", num, (void *)columnIndices);

  if (num == 0)
    return;

  GUROBI_CALL("deleteCols", GRBupdatemodel(getMutableLpPtr()));

  int *ind = NULL;

  if (nauxcols) {
    int nc = getNumCols();

    ind = new int[num];

    // translate into gurobi indices and sort
    for (int i = 0; i < num; ++i)
      ind[i] = colmap_O2G[columnIndices[i]];
    qsort((void *)ind, num, sizeof(int), intcompare);

    // delete indices in gurobi
    GUROBI_CALL("deleteCols", GRBdelvars(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), num, ind));

    nc -= num;

    // update colmap_G2O and auxcolind
    int offset = 0;
    int j = 0;
    for (int i = ind[0]; i < nc + nauxcols; ++i) {
      if (j < num && i == ind[j]) { // variable i has been deleted, increase offset by 1
        assert(colmap_G2O[i] >= 0);
        ++offset;
        while (j < num && i == ind[j])
          ++j;
      }
      // variable from position i+offset has moved to position i
      if (colmap_G2O[i + offset] >= 0) { // if variable at (hithero) position i+offset was a regular variable, then it is now stored at position i
        // substract offset since variable indices also changed in Osi
        colmap_G2O[i] = colmap_G2O[i + offset] - offset;
        assert(colmap_G2O[i] >= 0);
        // update also colmap_O2G
        colmap_O2G[colmap_G2O[i]] = i;
      } else { // if variable at (hithero) position i+offset was an auxiliary variable, then the corresponding row index is now stored at position i
        int rngrowidx = -colmap_G2O[i + offset] - 1;
        assert(auxcolind[rngrowidx] == i + offset);
        colmap_G2O[i] = colmap_G2O[i + offset];
        // update also auxcolind to point to position i now
        auxcolind[rngrowidx] = i;
      }
    }
  } else {
    GUROBI_CALL("deleteCols", GRBdelvars(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), num, const_cast< int * >(columnIndices)));
  }

#ifndef NDEBUG
  if (nauxcols) {
    int nc = getNumCols();
    int nr = getNumRows();
    for (int i = 0; i < nc + nauxcols; ++i) {
      assert(i >= nc || colmap_G2O[colmap_O2G[i]] == i);
      assert(colmap_G2O[i] < 0 || colmap_O2G[colmap_G2O[i]] == i);
      assert(colmap_G2O[i] >= 0 || -colmap_G2O[i] - 1 < nr);
      assert(colmap_G2O[i] >= 0 || auxcolind[-colmap_G2O[i] - 1] == i);
    }
  }
#endif

  if (!getColNames().empty() || coltype_ != NULL) {
    if (ind == NULL)
      ind = new int[num];

    memcpy(ind, columnIndices, num * sizeof(int));
    qsort((void *)ind, num, sizeof(int), intcompare);

    if (!getColNames().empty())
      for (int i = num - 1; i >= 0; --i)
        deleteColNames(ind[i], 1);

    if (coltype_ != NULL) {
      int offset = 0;
      for (int i = 0; i <= getNumCols(); ++i) {
        // variable i+offset was deleted
        if (offset < num && ind[offset] == i + offset)
          ++offset;

        // move column type from position i+offset to i
        coltype_[i] = coltype_[i + offset];
      }
    }
  }

  delete[] ind;
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::addRow(const CoinPackedVectorBase &vec,
  const double rowlb, const double rowub)
{
  debugMessage("OsiGrbSolverInterface::addRow(%p, %g, %g)\n", (void *)&vec, rowlb, rowub);

  char sense;
  double rhs, range;

  convertBoundToSense(rowlb, rowub, sense, rhs, range);

  addRow(vec, sense, rhs, range);
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::addRow(const CoinPackedVectorBase &vec,
  const char rowsen, const double rowrhs,
  const double rowrng)
{
  debugMessage("OsiGrbSolverInterface::addRow(%p, %c, %g, %g)\n", (void *)&vec, rowsen, rowrhs, rowrng);

  char grbsense;
  double rhs = rowrhs;

  switch (rowsen) {
  case 'R':
    /* ranged rows are added as equality rows first, and then an auxiliary variable is added */
    assert(rowrng > 0.0);
    grbsense = GRB_EQUAL;
    rhs = 0.0;
    break;

  case 'N':
    grbsense = GRB_LESS_EQUAL;
    rhs = getInfinity();
    break;

  case 'L':
    grbsense = GRB_LESS_EQUAL;
    break;

  case 'G':
    grbsense = GRB_GREATER_EQUAL;
    break;

  case 'E':
    grbsense = GRB_EQUAL;
    break;

  default:
    std::cerr << "Unknown row sense: " << rowsen << std::endl;
    exit(-1);
  }

  GUROBI_CALL("addRow", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("addRow", GRBaddconstr(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_COLUMN), vec.getNumElements(), const_cast< int * >(vec.getIndices()), const_cast< double * >(vec.getElements()), grbsense, rhs, NULL));

  if (rowsen == 'R')
    convertToRangedRow(getNumRows() - 1, rowrhs, rowrng);
  else if (nauxcols)
    resizeAuxColIndSpace();
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::addRows(const int numrows,
  const CoinPackedVectorBase *const *rows,
  const double *rowlb, const double *rowub)
{
  debugMessage("OsiGrbSolverInterface::addRows(%d, %p, %p, %p)\n", numrows, (void *)rows, (void *)rowlb, (void *)rowub);

  int i;
  int nz = 0;
  for (i = 0; i < numrows; ++i)
    nz += rows[i]->getNumElements();

  int *index = new int[nz];
  double *elem = new double[nz];
  int *start = new int[numrows + 1];
  char *grbsense = new char[numrows];
  double *rhs = new double[numrows];
  double range;

  bool haverangedrows = false;

  nz = 0;
  start[0] = 0;
  for (i = 0; i < numrows; ++i) {
    const CoinPackedVectorBase *row = rows[i];
    const int len = row->getNumElements();
    CoinDisjointCopyN(row->getIndices(), len, index + nz);
    CoinDisjointCopyN(row->getElements(), len, elem + nz);
    nz += len;
    start[i + 1] = nz;

    convertBoundToSense(rowlb[i], rowub[i], grbsense[i], rhs[i], range);
    if (range || grbsense[i] == 'R') {
      grbsense[i] = 'E';
      rhs[i] = 0.0;
      haverangedrows = true;
    }

    switch (grbsense[i]) {
    case 'N':
      grbsense[i] = GRB_LESS_EQUAL;
      rhs[i] = getInfinity();
      break;
    case 'L':
      grbsense[i] = GRB_LESS_EQUAL;
      break;
    case 'G':
      grbsense[i] = GRB_GREATER_EQUAL;
      break;
    case 'E':
      grbsense[i] = GRB_EQUAL;
      break;
    }
  }

  GUROBI_CALL("addRows", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("addRows", GRBaddconstrs(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), numrows, nz, start, index, elem, grbsense, rhs, NULL));

  delete[] start;
  delete[] elem;
  delete[] index;
  delete[] grbsense;
  delete[] rhs;

  if (haverangedrows) {
    int nr = getNumRows() - numrows;
    for (i = 0; i < numrows; ++i)
      if (rowlb[i] > getInfinity() && rowub[i] < getInfinity() && rowub[i] - rowlb[i] > 0.0)
        convertToRangedRow(nr + i, rowub[i], rowub[i] - rowlb[i]);
  } else if (nauxcols)
    resizeAuxColIndSpace();
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::addRows(const int numrows,
  const CoinPackedVectorBase *const *rows,
  const char *rowsen, const double *rowrhs,
  const double *rowrng)
{
  debugMessage("OsiGrbSolverInterface::addRows(%d, %p, %p, %p, %p)\n", numrows, (void *)rows, (void *)rowsen, (void *)rowrhs, (void *)rowrng);

  int i;
  int nz = 0;
  for (i = 0; i < numrows; ++i)
    nz += rows[i]->getNumElements();

  int *index = new int[nz];
  double *elem = new double[nz];
  int *start = new int[numrows + 1];
  char *grbsense = new char[numrows];
  double *rhs = new double[numrows];
  bool haverangedrows = false;

  nz = 0;
  start[0] = 0;
  for (i = 0; i < numrows; ++i) {
    const CoinPackedVectorBase *row = rows[i];
    const int len = row->getNumElements();
    CoinDisjointCopyN(row->getIndices(), len, index + nz);
    CoinDisjointCopyN(row->getElements(), len, elem + nz);
    nz += len;
    start[i + 1] = nz;

    rhs[i] = rowrhs[i];

    switch (rowsen[i]) {
    case 'R':
      assert(rowrng[i] > 0.0);
      grbsense[i] = GRB_EQUAL;
      rhs[i] = 0.0;
      haverangedrows = true;
      break;
    case 'N':
      grbsense[i] = GRB_LESS_EQUAL;
      rhs[i] = getInfinity();
      break;
    case 'L':
      grbsense[i] = GRB_LESS_EQUAL;
      break;
    case 'G':
      grbsense[i] = GRB_GREATER_EQUAL;
      break;
    case 'E':
      grbsense[i] = GRB_EQUAL;
      break;
    }
  }

  GUROBI_CALL("addRows", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("addRows", GRBaddconstrs(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), numrows, nz, start, index, elem, grbsense, rhs, NULL));

  delete[] start;
  delete[] elem;
  delete[] index;
  delete[] grbsense;
  delete[] rhs;

  if (haverangedrows) {
    int nr = getNumRows() - numrows;
    for (i = 0; i < numrows; ++i)
      if (rowsen[i] == 'R')
        convertToRangedRow(nr + i, rowrhs[i], rowrng[i]);
  } else if (nauxcols)
    resizeAuxColIndSpace();
}

//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::deleteRows(const int num, const int *rowIndices)
{
  debugMessage("OsiGrbSolverInterface::deleteRows(%d, %p)\n", num, (void *)rowIndices);

  if (nauxcols) { // check if a ranged row should be deleted; if so, then convert it into a normal row first
    for (int i = 0; i < num; ++i) {
      if (auxcolind[rowIndices[i]] >= 0)
        convertToNormalRow(rowIndices[i], 'E', 0.0);
    }
  }

  GUROBI_CALL("deleteRows", GRBdelconstrs(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_COLUMN), num, const_cast< int * >(rowIndices)));

  if (nauxcols == 0 && getRowNames().empty())
    return;

  int *ind = CoinCopyOfArray(rowIndices, num);
  qsort((void *)ind, num, sizeof(int), intcompare);

  if (nauxcols) {
    int nr = getNumRows();

    int offset = 0;
    int j = 0;
    for (int i = 0; i < nr; ++i) {
      if (j < num && i == ind[j]) {
        ++offset;
        while (j < num && i == ind[j])
          ++j;
      }
      auxcolind[i] = auxcolind[i + offset];
      if (auxcolind[i] >= 0)
        colmap_G2O[auxcolind[i]] = -i - 1;
    }
  }

#ifndef NDEBUG
  if (nauxcols) {
    int nc = getNumCols();
    int nr = getNumRows();
    for (int i = 0; i < nc + nauxcols; ++i) {
      assert(i >= nc || colmap_G2O[colmap_O2G[i]] == i);
      assert(colmap_G2O[i] < 0 || colmap_O2G[colmap_G2O[i]] == i);
      assert(colmap_G2O[i] >= 0 || -colmap_G2O[i] - 1 < nr);
      assert(colmap_G2O[i] >= 0 || auxcolind[-colmap_G2O[i] - 1] == i);
    }
  }
#endif

  if (!getRowNames().empty())
    for (int i = num - 1; i >= 0; --i)
      deleteRowNames(ind[i], 1);

  delete[] ind;
}

//#############################################################################
// Methods to input a problem
//#############################################################################

void OsiGrbSolverInterface::loadProblem(const CoinPackedMatrix &matrix,
  const double *collb, const double *colub,
  const double *obj,
  const double *rowlb, const double *rowub)
{
  debugMessage("OsiGrbSolverInterface::loadProblem(1)(%p, %p, %p, %p, %p, %p)\n", (void *)&matrix, (void *)collb, (void *)colub, (void *)obj, (void *)rowlb, (void *)rowub);

  const double inf = getInfinity();

  int nrows = matrix.getNumRows();
  char *rowSense = new char[nrows];
  double *rowRhs = new double[nrows];
  double *rowRange = new double[nrows];

  int i;
  for (i = nrows - 1; i >= 0; --i) {
    const double lower = rowlb ? rowlb[i] : -inf;
    const double upper = rowub ? rowub[i] : inf;
    convertBoundToSense(lower, upper, rowSense[i], rowRhs[i], rowRange[i]);
  }

  loadProblem(matrix, collb, colub, obj, rowSense, rowRhs, rowRange);
  delete[] rowSense;
  delete[] rowRhs;
  delete[] rowRange;
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::assignProblem(CoinPackedMatrix *&matrix,
  double *&collb, double *&colub,
  double *&obj,
  double *&rowlb, double *&rowub)
{
  debugMessage("OsiGrbSolverInterface::assignProblem()\n");

  loadProblem(*matrix, collb, colub, obj, rowlb, rowub);
  delete matrix;
  matrix = 0;
  delete[] collb;
  collb = 0;
  delete[] colub;
  colub = 0;
  delete[] obj;
  obj = 0;
  delete[] rowlb;
  rowlb = 0;
  delete[] rowub;
  rowub = 0;
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::loadProblem(const CoinPackedMatrix &matrix,
  const double *collb, const double *colub,
  const double *obj,
  const char *rowsen, const double *rowrhs,
  const double *rowrng)
{
  debugMessage("OsiGrbSolverInterface::loadProblem(2)(%p, %p, %p, %p, %p, %p, %p)\n",
    (void *)&matrix, (void *)collb, (void *)colub, (void *)obj, (void *)rowsen, (void *)rowrhs, (void *)rowrng);

  int nc = matrix.getNumCols();
  int nr = matrix.getNumRows();
  int i;

  char *myrowsen = new char[nr];
  double *myrowrhs = new double[nr];
  bool haverangedrows = false;

  for (i = 0; i < nr; ++i) {
    if (rowrhs)
      myrowrhs[i] = rowrhs[i];
    else
      myrowrhs[i] = 0.0;

    if (rowsen)
      switch (rowsen[i]) {
      case 'R':
        assert(rowrng && rowrng[i] > 0.0);
        myrowsen[i] = GRB_EQUAL;
        myrowrhs[i] = 0.0;
        haverangedrows = true;
        break;

      case 'N':
        myrowsen[i] = GRB_LESS_EQUAL;
        myrowrhs[i] = getInfinity();
        break;

      case 'L':
        myrowsen[i] = GRB_LESS_EQUAL;
        break;

      case 'G':
        myrowsen[i] = GRB_GREATER_EQUAL;
        break;

      case 'E':
        myrowsen[i] = GRB_EQUAL;
        break;
      }
    else
      myrowsen[i] = 'G';
  }

  // Set column values to defaults if NULL pointer passed
  double *clb;
  double *cub;
  double *ob;
  if (collb != NULL)
    clb = const_cast< double * >(collb);
  else {
    clb = new double[nc];
    CoinFillN(clb, nc, 0.0);
  }

  if (colub != NULL)
    cub = const_cast< double * >(colub);
  else {
    cub = new double[nc];
    CoinFillN(cub, nc, getInfinity());
  }

  if (obj != NULL)
    ob = const_cast< double * >(obj);
  else {
    ob = new double[nc];
    CoinFillN(ob, nc, 0.0);
  }

  bool freeMatrixRequired = false;
  CoinPackedMatrix *m = NULL;

  if (!matrix.isColOrdered()) {
    m = new CoinPackedMatrix();
    m->reverseOrderedCopyOf(matrix);
    freeMatrixRequired = true;
  } else
    m = const_cast< CoinPackedMatrix * >(&matrix);

    // up to GUROBI 2.0.1, GUROBI may give an "Index is out of range" error if the constraint matrix has uninitalized "gaps"
#if (GRB_VERSION_MAJOR < 2) || (GRB_VERSION_MAJOR == 2 && GRB_VERSION_MINOR == 0 && GRB_VERSION_TECHNICAL <= 1)
  if (m->hasGaps()) {
    if (freeMatrixRequired) {
      m->removeGaps();
    } else {
      m = new CoinPackedMatrix(matrix);
      if (m->hasGaps())
        m->removeGaps();
      freeMatrixRequired = true;
    }
  }
#endif

  assert(nc == m->getNumCols());
  assert(nr == m->getNumRows());
  assert(m->isColOrdered());

  int modelsense;
  GUROBI_CALL("loadProblem", GRBupdatemodel(getMutableLpPtr()));

  GUROBI_CALL("loadProblem", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_MODELSENSE, &modelsense));

  std::string pn;
  getStrParam(OsiProbName, pn);

  gutsOfDestructor(); // kill old LP, if any

  GUROBI_CALL("loadProblem", GRBloadmodel(getEnvironmentPtr(), &lp_, const_cast< char * >(pn.c_str()), nc, nr, modelsense, 0.0, ob, const_cast< char * >(myrowsen), myrowrhs, const_cast< int * >(m->getVectorStarts()), const_cast< int * >(m->getVectorLengths()), const_cast< int * >(m->getIndices()), const_cast< double * >(m->getElements()), const_cast< double * >(clb), const_cast< double * >(cub), NULL, NULL, NULL));

  // GUROBI up to version 2.0.1 may return a scaled LP after GRBoptimize when requesting it via GRBgetvars
#if (GRB_VERSION_MAJOR < 2) || (GRB_VERSION_MAJOR == 2 && GRB_VERSION_MINOR == 0 && GRB_VERSION_TECHNICAL <= 1)
  setHintParam(OsiDoScale, false);
#endif

  delete[] myrowsen;
  delete[] myrowrhs;
  if (collb == NULL)
    delete[] clb;
  if (colub == NULL)
    delete[] cub;
  if (obj == NULL)
    delete[] ob;
  if (freeMatrixRequired)
    delete m;

  resizeColSpace(nc);
  CoinFillN(coltype_, nc, GRB_CONTINUOUS);

  if (haverangedrows) {
    assert(rowrhs);
    assert(rowrng);
    assert(rowsen);
    for (i = 0; i < nr; ++i)
      if (rowsen[i] == 'R')
        convertToRangedRow(i, rowrhs[i], rowrng[i]);
  }
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::assignProblem(CoinPackedMatrix *&matrix,
  double *&collb, double *&colub,
  double *&obj,
  char *&rowsen, double *&rowrhs,
  double *&rowrng)
{
  debugMessage("OsiGrbSolverInterface::assignProblem()\n");

  loadProblem(*matrix, collb, colub, obj, rowsen, rowrhs, rowrng);
  delete matrix;
  matrix = NULL;
  delete[] collb;
  collb = NULL;
  delete[] colub;
  colub = NULL;
  delete[] obj;
  obj = NULL;
  delete[] rowsen;
  rowsen = NULL;
  delete[] rowrhs;
  rowrhs = NULL;
  delete[] rowrng;
  rowrng = NULL;
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::loadProblem(const int numcols, const int numrows,
  const int *start, const int *index,
  const double *value,
  const double *collb, const double *colub,
  const double *obj,
  const double *rowlb, const double *rowub)
{
  debugMessage("OsiGrbSolverInterface::loadProblem(3)()\n");

  const double inf = getInfinity();

  char *rowSense = new char[numrows];
  double *rowRhs = new double[numrows];
  double *rowRange = new double[numrows];

  for (int i = numrows - 1; i >= 0; --i) {
    const double lower = rowlb ? rowlb[i] : -inf;
    const double upper = rowub ? rowub[i] : inf;
    convertBoundToSense(lower, upper, rowSense[i], rowRhs[i], rowRange[i]);
  }

  loadProblem(numcols, numrows, start, index, value, collb, colub, obj, rowSense, rowRhs, rowRange);

  delete[] rowSense;
  delete[] rowRhs;
  delete[] rowRange;
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::loadProblem(const int numcols, const int numrows,
  const int *start, const int *index,
  const double *value,
  const double *collb, const double *colub,
  const double *obj,
  const char *rowsen, const double *rowrhs,
  const double *rowrng)
{
  debugMessage("OsiGrbSolverInterface::loadProblem(4)(%d, %d, %p, %p, %p, %p, %p, %p, %p, %p, %p)\n",
    numcols, numrows, (void *)start, (void *)index, (void *)value, (void *)collb, (void *)colub, (void *)obj, (void *)rowsen, (void *)rowrhs, (void *)rowrng);

  int nc = numcols;
  int nr = numrows;
  int i;

  char *myrowsen = new char[nr];
  double *myrowrhs = new double[nr];
  bool haverangedrows = false;

  for (i = 0; i < nr; i++) {
    if (rowrhs)
      myrowrhs[i] = rowrhs[i];
    else
      myrowrhs[i] = 0.0;

    if (rowsen)
      switch (rowsen[i]) {
      case 'R':
        assert(rowrng && rowrng[i] > 0.0);
        myrowsen[i] = GRB_EQUAL;
        myrowrhs[i] = 0.0;
        haverangedrows = true;
        break;

      case 'N':
        myrowsen[i] = GRB_LESS_EQUAL;
        myrowrhs[i] = getInfinity();
        break;

      case 'L':
        myrowsen[i] = GRB_LESS_EQUAL;
        break;

      case 'G':
        myrowsen[i] = GRB_GREATER_EQUAL;
        break;

      case 'E':
        myrowsen[i] = GRB_EQUAL;
        break;
      }
    else
      myrowsen[i] = 'G';
  }

  // Set column values to defaults if NULL pointer passed
  double *clb;
  double *cub;
  double *ob;
  if (collb != NULL)
    clb = const_cast< double * >(collb);
  else {
    clb = new double[nc];
    CoinFillN(clb, nc, 0.0);
  }

  if (colub != NULL)
    cub = const_cast< double * >(colub);
  else {
    cub = new double[nc];
    CoinFillN(cub, nc, getInfinity());
  }

  if (obj != NULL)
    ob = const_cast< double * >(obj);
  else {
    ob = new double[nc];
    CoinFillN(ob, nc, 0.0);
  }

  int *len = new int[nc];
  for (i = 0; i < nc; ++i)
    len[i] = start[i + 1] - start[i];

  GUROBI_CALL("loadProblem", GRBupdatemodel(getMutableLpPtr()));

  int modelsense;
  GUROBI_CALL("loadProblem", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_MODELSENSE, &modelsense));

  std::string pn;
  getStrParam(OsiProbName, pn);

  gutsOfDestructor(); // kill old LP, if any

  GUROBI_CALL("loadProblem", GRBloadmodel(getEnvironmentPtr(), &lp_, const_cast< char * >(pn.c_str()), nc, nr, modelsense, 0.0, ob, myrowsen, myrowrhs, const_cast< int * >(start), len, const_cast< int * >(index), const_cast< double * >(value), const_cast< double * >(clb), const_cast< double * >(cub), NULL, NULL, NULL));

  // GUROBI up to version 2.0.1 may return a scaled LP after GRBoptimize when requesting it via GRBgetvars
#if (GRB_VERSION_MAJOR < 2) || (GRB_VERSION_MAJOR == 2 && GRB_VERSION_MINOR == 0 && GRB_VERSION_TECHNICAL <= 1)
  setHintParam(OsiDoScale, false);
#endif

  delete[] myrowsen;
  delete[] myrowrhs;
  if (collb == NULL)
    delete[] clb;
  if (colub == NULL)
    delete[] cub;
  if (obj == NULL)
    delete[] ob;
  delete[] len;

  resizeColSpace(nc);
  CoinFillN(coltype_, nc, GRB_CONTINUOUS);

  if (haverangedrows) {
    assert(rowrhs);
    assert(rowrng);
    assert(rowsen);
    for (i = 0; i < nr; ++i)
      if (rowsen[i] == 'R')
        convertToRangedRow(i, rowrhs[i], rowrng[i]);
  }
}

//-----------------------------------------------------------------------------
// Read mps files
//-----------------------------------------------------------------------------
int OsiGrbSolverInterface::readMps(const char *filename,
  const char *extension)
{
  debugMessage("OsiGrbSolverInterface::readMps(%s, %s)\n", filename, extension);

  // just call base class method
  return OsiSolverInterface::readMps(filename, extension);
}

//-----------------------------------------------------------------------------
// Write mps files
//-----------------------------------------------------------------------------
void OsiGrbSolverInterface::writeMps(const char *filename,
  const char *extension,
  double objSense) const
{
  debugMessage("OsiGrbSolverInterface::writeMps(%s, %s, %g)\n", filename, extension, objSense);

  std::string f(filename);
  std::string e(extension);
  std::string fullname = f + "." + e;

  //TODO give row and column names?
  writeMpsNative(fullname.c_str(), NULL, NULL);

  // do not call Gurobi's MPS writer, because
  // 1. it only writes mps if the extension is mps
  // 2. the instance in Gurobi may have extra columns due to reformulated ranged rows, that may be confusing
  //  GUROBI_CALL( "writeMps", GRBwrite(getMutableLpPtr(), const_cast<char*>(fullname.c_str())) );
}

//#############################################################################
// CPX specific public interfaces
//#############################################################################

GRBenv *OsiGrbSolverInterface::getEnvironmentPtr() const
{
  assert(localenv_ != NULL || globalenv_ != NULL);
  return localenv_ ? localenv_ : globalenv_;
}

GRBmodel *OsiGrbSolverInterface::getLpPtr(int keepCached)
{
  freeCachedData(keepCached);
  return getMutableLpPtr();
}

/// Return whether the current Gurobi environment runs in demo mode.
bool OsiGrbSolverInterface::isDemoLicense() const
{
  debugMessage("OsiGrbSolverInterface::isDemoLicense()\n");

  GRBenv *env = getEnvironmentPtr();

  GRBmodel *testlp;

  // a Gurobi demo license allows to solve only models with up to 500 variables
  // thus, let's try to create and solve a model with 1000 variables
  GUROBI_CALL("isDemoLicense", GRBnewmodel(env, &testlp, "licensetest", 1000, NULL, NULL, NULL, NULL, NULL));
  //  GUROBI_CALL( "resolve", GRBsetintparam(GRBgetenv(testlp), GRB_INT_PAR_PRESOLVE, presolve) );

  int rc = GRBoptimize(testlp);

  if (rc == GRB_ERROR_SIZE_LIMIT_EXCEEDED)
    return true;

  GUROBI_CALL("isDemoLicense", rc);

  GRBfreemodel(testlp);

  return false;
}

//-----------------------------------------------------------------------------

const char *OsiGrbSolverInterface::getCtype() const
{
  debugMessage("OsiGrbSolverInterface::getCtype()\n");

  return coltype_;
}

//#############################################################################
// Static instance counter methods
//#############################################################################

void OsiGrbSolverInterface::incrementInstanceCounter()
{
  if (numInstances_ == 0 && !globalenv_) {
    GUROBI_CALL("incrementInstanceCounter", GRBloadenv(&globalenv_, NULL));
    assert(globalenv_ != NULL);
    globalenv_is_ours = true;
  }
  numInstances_++;
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::decrementInstanceCounter()
{
  assert(numInstances_ != 0);
  assert(globalenv_ != NULL);
  numInstances_--;
  if (numInstances_ == 0 && globalenv_is_ours) {
    GRBfreeenv(globalenv_);
    globalenv_ = NULL;
  }
}

//-----------------------------------------------------------------------------

unsigned int OsiGrbSolverInterface::getNumInstances()
{
  return numInstances_;
}

void OsiGrbSolverInterface::setEnvironment(GRBenv *globalenv)
{
  if (numInstances_) {
    assert(globalenv_);
    throw CoinError("Cannot set global GUROBI environment, since some OsiGrb instance is still using it.", "setEnvironment", "OsiGrbSolverInterface", __FILE__, __LINE__);
  }

  assert(!globalenv_ || !globalenv_is_ours);

  globalenv_ = globalenv;
  globalenv_is_ours = false;
}

//#############################################################################
// Constructors, destructors clone and assignment
//#############################################################################

//-------------------------------------------------------------------
// Default Constructor
//-------------------------------------------------------------------
OsiGrbSolverInterface::OsiGrbSolverInterface(bool use_local_env)
  : OsiSolverInterface()
  , localenv_(NULL)
  , lp_(NULL)
  , hotStartCStat_(NULL)
  , hotStartCStatSize_(0)
  , hotStartRStat_(NULL)
  , hotStartRStatSize_(0)
  , hotStartMaxIteration_(1000000)
  , // ??? default iteration limit for strong branching is large
  nameDisc_(0)
  , obj_(NULL)
  , collower_(NULL)
  , colupper_(NULL)
  , rowsense_(NULL)
  , rhs_(NULL)
  , rowrange_(NULL)
  , rowlower_(NULL)
  , rowupper_(NULL)
  , colsol_(NULL)
  , rowsol_(NULL)
  , redcost_(NULL)
  , rowact_(NULL)
  , matrixByRow_(NULL)
  , matrixByCol_(NULL)
  , probtypemip_(false)
  , domipstart(false)
  , colspace_(0)
  , coltype_(NULL)
  , nauxcols(0)
  , auxcolspace(0)
  , colmap_O2G(NULL)
  , colmap_G2O(NULL)
  , auxcolindspace(0)
  , auxcolind(NULL)
{
  debugMessage("OsiGrbSolverInterface::OsiGrbSolverInterface()\n");

  if (use_local_env) {
    GUROBI_CALL("OsiGrbSolverInterface", GRBloadenv(&localenv_, NULL));
    assert(localenv_ != NULL);
  } else
    incrementInstanceCounter();

  gutsOfConstructor();

  // change Osi default to Gurobi default
  setHintParam(OsiDoDualInInitial, true, OsiHintTry);
}

OsiGrbSolverInterface::OsiGrbSolverInterface(GRBenv *localgrbenv)
  : OsiSolverInterface()
  , localenv_(localgrbenv)
  , lp_(NULL)
  , hotStartCStat_(NULL)
  , hotStartCStatSize_(0)
  , hotStartRStat_(NULL)
  , hotStartRStatSize_(0)
  , hotStartMaxIteration_(1000000)
  , // ??? default iteration limit for strong branching is large
  nameDisc_(0)
  , obj_(NULL)
  , collower_(NULL)
  , colupper_(NULL)
  , rowsense_(NULL)
  , rhs_(NULL)
  , rowrange_(NULL)
  , rowlower_(NULL)
  , rowupper_(NULL)
  , colsol_(NULL)
  , rowsol_(NULL)
  , redcost_(NULL)
  , rowact_(NULL)
  , matrixByRow_(NULL)
  , matrixByCol_(NULL)
  , probtypemip_(false)
  , domipstart(false)
  , colspace_(0)
  , coltype_(NULL)
  , nauxcols(0)
  , auxcolspace(0)
  , colmap_O2G(NULL)
  , colmap_G2O(NULL)
  , auxcolindspace(0)
  , auxcolind(NULL)
{
  debugMessage("OsiGrbSolverInterface::OsiGrbSolverInterface()\n");

  if (localenv_ == NULL) { // if user called this constructor with NULL pointer, we assume that he meant that a local environment should be created
    GUROBI_CALL("OsiGrbSolverInterface", GRBloadenv(&localenv_, NULL));
    assert(localenv_ != NULL);
  }

  gutsOfConstructor();

  // change Osi default to Gurobi default
  setHintParam(OsiDoDualInInitial, true, OsiHintTry);
}

//----------------------------------------------------------------
// Clone
//----------------------------------------------------------------
OsiSolverInterface *OsiGrbSolverInterface::clone(bool copyData) const
{
  debugMessage("OsiGrbSolverInterface::clone(%d)\n", copyData);

  return (new OsiGrbSolverInterface(*this));
}

//-------------------------------------------------------------------
// Copy constructor
//-------------------------------------------------------------------
OsiGrbSolverInterface::OsiGrbSolverInterface(const OsiGrbSolverInterface &source)
  : OsiSolverInterface(source)
  , localenv_(NULL)
  , lp_(NULL)
  , hotStartCStat_(NULL)
  , hotStartCStatSize_(0)
  , hotStartRStat_(NULL)
  , hotStartRStatSize_(0)
  , hotStartMaxIteration_(source.hotStartMaxIteration_)
  , nameDisc_(source.nameDisc_)
  , obj_(NULL)
  , collower_(NULL)
  , colupper_(NULL)
  , rowsense_(NULL)
  , rhs_(NULL)
  , rowrange_(NULL)
  , rowlower_(NULL)
  , rowupper_(NULL)
  , colsol_(NULL)
  , rowsol_(NULL)
  , redcost_(NULL)
  , rowact_(NULL)
  , matrixByRow_(NULL)
  , matrixByCol_(NULL)
  , probtypemip_(false)
  , domipstart(false)
  , colspace_(0)
  , coltype_(NULL)
  , nauxcols(0)
  , auxcolspace(0)
  , colmap_O2G(NULL)
  , colmap_G2O(NULL)
  , auxcolindspace(0)
  , auxcolind(NULL)
{
  debugMessage("OsiGrbSolverInterface::OsiGrbSolverInterface(%p)\n", (void *)&source);

  if (source.localenv_) {
    GUROBI_CALL("OsiGrbSolverInterface", GRBloadenv(&localenv_, NULL));
    assert(localenv_ != NULL);
  } else
    incrementInstanceCounter();

  gutsOfConstructor();
  gutsOfCopy(source);
}

//-------------------------------------------------------------------
// Destructor
//-------------------------------------------------------------------
OsiGrbSolverInterface::~OsiGrbSolverInterface()
{
  debugMessage("OsiGrbSolverInterface::~OsiGrbSolverInterface()\n");

  gutsOfDestructor();
  if (localenv_) {
    GRBfreeenv(localenv_);
  } else
    decrementInstanceCounter();
}

//----------------------------------------------------------------
// Assignment operator
//-------------------------------------------------------------------
OsiGrbSolverInterface &OsiGrbSolverInterface::operator=(const OsiGrbSolverInterface &rhs)
{
  debugMessage("OsiGrbSolverInterface::operator=(%p)\n", (void *)&rhs);

  if (this != &rhs) {
    OsiSolverInterface::operator=(rhs);
    gutsOfDestructor();
    gutsOfConstructor();
    if (rhs.lp_ != NULL)
      gutsOfCopy(rhs);
  }

  return *this;
}

//#############################################################################
// Applying cuts
//#############################################################################

OsiSolverInterface::ApplyCutsReturnCode OsiGrbSolverInterface::applyCuts(const OsiCuts &cs,
  double effectivenessLb)
{
  debugMessage("OsiGrbSolverInterface::applyCuts(%p)\n", (void *)&cs);

  OsiSolverInterface::ApplyCutsReturnCode retVal;
  int i;

  // Loop once for each column cut
  for (i = 0; i < cs.sizeColCuts(); i++) {
    if (cs.colCut(i).effectiveness() < effectivenessLb) {
      retVal.incrementIneffective();
      continue;
    }
    if (!cs.colCut(i).consistent()) {
      retVal.incrementInternallyInconsistent();
      continue;
    }
    if (!cs.colCut(i).consistent(*this)) {
      retVal.incrementExternallyInconsistent();
      continue;
    }
    if (cs.colCut(i).infeasible(*this)) {
      retVal.incrementInfeasible();
      continue;
    }
    applyColCut(cs.colCut(i));
    retVal.incrementApplied();
  }

  // Loop once for each row cut
  int nToApply = 0;
  size_t space = 0;

  for (i = 0; i < cs.sizeRowCuts(); i++) {
    if (cs.rowCut(i).effectiveness() < effectivenessLb) {
      retVal.incrementIneffective();
      continue;
    }
    if (!cs.rowCut(i).consistent()) {
      retVal.incrementInternallyInconsistent();
      continue;
    }
    if (!cs.rowCut(i).consistent(*this)) {
      retVal.incrementExternallyInconsistent();
      continue;
    }
    if (cs.rowCut(i).infeasible(*this)) {
      retVal.incrementInfeasible();
      continue;
    }
    nToApply++;
    space += cs.rowCut(i).row().getNumElements();

    retVal.incrementApplied();
  }

  int base_row = getNumRows();
  int base_col = getNumCols() + nauxcols;

  //now apply row cuts jointly
  int *start = new int[nToApply + 1];
  int *indices = new int[space];
  double *values = new double[space];
  double *lower = new double[nToApply];
  double *upper = new double[nToApply];

  int cur = 0;
  int r = 0;

  int nTrulyRanged = nToApply;
  for (i = 0; i < cs.sizeRowCuts(); i++) {

    if (cs.rowCut(i).effectiveness() < effectivenessLb) {
      continue;
    }
    if (!cs.rowCut(i).consistent()) {
      continue;
    }
    if (!cs.rowCut(i).consistent(*this)) {
      continue;
    }
    if (cs.rowCut(i).infeasible(*this)) {
      continue;
    }

    start[r] = cur;

    const OsiRowCut &rowCut = cs.rowCut(i);

    lower[r] = rowCut.lb();
    upper[r] = rowCut.ub();

    std::cerr << "range " << lower[r] << " - " << upper[r] << std::endl;

    if (lower[r] <= -getInfinity()) {
      lower[r] = -GRB_INFINITY;
      nTrulyRanged--;
    } else if (upper[r] >= getInfinity()) {
      upper[r] = GRB_INFINITY;
      nTrulyRanged--;
    }

    for (int k = 0; k < rowCut.row().getNumElements(); k++) {
      values[cur + k] = rowCut.row().getElements()[k];
      indices[cur + k] = rowCut.row().getIndices()[k];
    }

    r++;
    cur += rowCut.row().getNumElements();
  }
  start[nToApply] = cur;

  int nPrevVars = getNumCols();

  GUROBI_CALL("applyRowCuts", GRBaddrangeconstrs(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_COLUMN), nToApply, static_cast< int >(space), start, indices, values, lower, upper, NULL));

  GUROBI_CALL("applyRowCuts", GRBupdatemodel(getMutableLpPtr()));

  // store correspondence between ranged rows and new variables added by Gurobi
  int nNewVars = getNumCols() - nPrevVars;

  if (nNewVars != nTrulyRanged) {

    std::cerr << "ERROR in applying cuts for Gurobi: " << __FILE__ << " : "
              << "line "
              << __LINE__ << " . Exiting" << std::endl;
    exit(-1);
  }

  if (nTrulyRanged > 0) {
    if (nauxcols == 0) {
      // this is the first ranged row
      assert(colmap_O2G == NULL);
      assert(colmap_G2O == NULL);

      assert(colspace_ >= getNumCols());

      auxcolspace = nTrulyRanged;
      colmap_G2O = new int[colspace_ + auxcolspace];
      CoinIotaN(colmap_G2O, colspace_ + auxcolspace, 0);

      colmap_O2G = CoinCopyOfArray(colmap_G2O, colspace_);
    } else {
      assert(colmap_O2G != NULL);
      assert(colmap_G2O != NULL);
      resizeAuxColSpace(nauxcols + nTrulyRanged);
    }

    nauxcols += nTrulyRanged;

    resizeAuxColIndSpace();

    int next = 0;
    for (int k = 0; k < nToApply; k++) {

      if (lower[k] > -GRB_INFINITY && upper[k] < GRB_INFINITY) {
        auxcolind[base_row + next] = base_col + next;
        colmap_G2O[auxcolind[base_row + next]] = -(base_row + next) - 1;
        next++;
      }
    }
  }

  delete[] start;
  delete[] indices;
  delete[] values;
  delete[] lower;
  delete[] upper;

  return retVal;
}

void OsiGrbSolverInterface::applyColCut(const OsiColCut &cc)
{
  debugMessage("OsiGrbSolverInterface::applyColCut(%p)\n", (void *)&cc);

  const double *gurobiColLB = getColLower();
  const double *gurobiColUB = getColUpper();
  const CoinPackedVector &lbs = cc.lbs();
  const CoinPackedVector &ubs = cc.ubs();
  int i;

  for (i = 0; i < lbs.getNumElements(); ++i)
    if (lbs.getElements()[i] > gurobiColLB[lbs.getIndices()[i]])
      setColLower(lbs.getIndices()[i], lbs.getElements()[i]);
  for (i = 0; i < ubs.getNumElements(); ++i)
    if (ubs.getElements()[i] < gurobiColUB[ubs.getIndices()[i]])
      setColUpper(ubs.getIndices()[i], ubs.getElements()[i]);
}

//-----------------------------------------------------------------------------

void OsiGrbSolverInterface::applyRowCut(const OsiRowCut &rowCut)
{
  debugMessage("OsiGrbSolverInterface::applyRowCut(%p)\n", (void *)&rowCut);

  double rhs = 0.0;
  char sns;
  double lb = rowCut.lb();
  double ub = rowCut.ub();
  bool isrange = false;
  if (lb <= -getInfinity() && ub >= getInfinity()) // free constraint
  {
    rhs = getInfinity();
    sns = GRB_LESS_EQUAL;
  } else if (lb <= -getInfinity()) // <= constraint
  {
    rhs = ub;
    sns = GRB_LESS_EQUAL;
  } else if (ub >= getInfinity()) // >= constraint
  {
    rhs = lb;
    sns = GRB_GREATER_EQUAL;
  } else if (ub == lb) // = constraint
  {
    rhs = ub;
    sns = GRB_EQUAL;
  } else // range constraint
  {
    rhs = 0.0;
    sns = GRB_EQUAL;
    isrange = true;
  }

  GUROBI_CALL("applyRowCut", GRBaddconstr(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_COLUMN), rowCut.row().getNumElements(), const_cast< int * >(rowCut.row().getIndices()), const_cast< double * >(rowCut.row().getElements()), sns, rhs, NULL));

  if (isrange) {
    convertToRangedRow(getNumRows() - 1, ub, ub - lb);
  } else if (nauxcols)
    resizeAuxColIndSpace();
}

//#############################################################################
// Private methods (non-static and static) and static data
//#############################################################################

//------------------------------------------------------------------
// Static data
//------------------------------------------------------------------
GRBenv *OsiGrbSolverInterface::globalenv_ = NULL;
bool OsiGrbSolverInterface::globalenv_is_ours = true;
unsigned int OsiGrbSolverInterface::numInstances_ = 0;

//-------------------------------------------------------------------
// Get pointer to GRBmodel*.
// const methods should use getMutableLpPtr().
// non-const methods should use getLpPtr().
//-------------------------------------------------------------------
GRBmodel *OsiGrbSolverInterface::getMutableLpPtr() const
{
  if (lp_ == NULL) {
    assert(getEnvironmentPtr() != NULL);

    GUROBI_CALL("getMutableLpPtr", GRBnewmodel(getEnvironmentPtr(), &lp_, "OsiGrb_problem", 0, NULL, NULL, NULL, NULL, NULL));
    assert(lp_ != NULL);

    // GUROBI up to version 2.0.1 may return a scaled LP after GRBoptimize when requesting it via GRBgetvars
#if (GRB_VERSION_MAJOR < 2) || (GRB_VERSION_MAJOR == 2 && GRB_VERSION_MINOR == 0 && GRB_VERSION_TECHNICAL <= 1)
    GUROBI_CALL("getMutableLpPtr", GRBsetintparam(GRBgetenv(lp_), GRB_INT_PAR_SCALEFLAG, 0));
#endif
  }
  return lp_;
}

//-------------------------------------------------------------------

void OsiGrbSolverInterface::gutsOfCopy(const OsiGrbSolverInterface &source)
{
  // Set Rim and constraints
  const double *obj = source.getObjCoefficients();
  const double *rhs = source.getRightHandSide();
  const char *sense = source.getRowSense();
  const CoinPackedMatrix *cols = source.getMatrixByCol();
  const double *lb = source.getColLower();
  const double *ub = source.getColUpper();
  loadProblem(*cols, lb, ub, obj, sense, rhs, source.getRowRange());

  // Set Objective Sense
  setObjSense(source.getObjSense());

  // Set Objective Constant
  double dblParam;
  source.getDblParam(OsiObjOffset, dblParam);
  setDblParam(OsiObjOffset, dblParam);

  // Set MIP information
  resizeColSpace(source.colspace_);
  CoinDisjointCopyN(source.coltype_, source.colspace_, coltype_);

  // Set Problem name
  std::string strParam;
  source.getStrParam(OsiProbName, strParam);
  setStrParam(OsiProbName, strParam);

  // Set Solution - not supported by Gurobi
  //  setColSolution(source.getColSolution());
  //  setRowPrice(source.getRowPrice());
}

//-------------------------------------------------------------------
void OsiGrbSolverInterface::gutsOfConstructor()
{
}

//-------------------------------------------------------------------
void OsiGrbSolverInterface::gutsOfDestructor()
{
  debugMessage("OsiGrbSolverInterface::gutsOfDestructor()\n");

  if (lp_ != NULL) {
    GUROBI_CALL("gutsOfDestructor", GRBfreemodel(lp_));
    lp_ = NULL;
    freeAllMemory();
  }
  assert(lp_ == NULL);
  assert(obj_ == NULL);
  assert(collower_ == NULL);
  assert(colupper_ == NULL);
  assert(rowsense_ == NULL);
  assert(rhs_ == NULL);
  assert(rowrange_ == NULL);
  assert(rowlower_ == NULL);
  assert(rowupper_ == NULL);
  assert(colsol_ == NULL);
  assert(rowsol_ == NULL);
  assert(redcost_ == NULL);
  assert(rowact_ == NULL);
  assert(matrixByRow_ == NULL);
  assert(matrixByCol_ == NULL);
  assert(coltype_ == NULL);
  assert(colspace_ == 0);
  assert(auxcolspace == 0);
  assert(auxcolindspace == 0);
}

//-------------------------------------------------------------------
/// free cached vectors

void OsiGrbSolverInterface::freeCachedColRim()
{
  freeCacheDouble(obj_);
  freeCacheDouble(collower_);
  freeCacheDouble(colupper_);
  assert(obj_ == NULL);
  assert(collower_ == NULL);
  assert(colupper_ == NULL);
}

void OsiGrbSolverInterface::freeCachedRowRim()
{
  freeCacheChar(rowsense_);
  freeCacheDouble(rhs_);
  freeCacheDouble(rowrange_);
  freeCacheDouble(rowlower_);
  freeCacheDouble(rowupper_);
  assert(rowsense_ == NULL);
  assert(rhs_ == NULL);
  assert(rowrange_ == NULL);
  assert(rowlower_ == NULL);
  assert(rowupper_ == NULL);
}

void OsiGrbSolverInterface::freeCachedMatrix()
{
  freeCacheMatrix(matrixByRow_);
  freeCacheMatrix(matrixByCol_);
  assert(matrixByRow_ == NULL);
  assert(matrixByCol_ == NULL);
}

void OsiGrbSolverInterface::freeCachedResults()
{
  freeCacheDouble(colsol_);
  freeCacheDouble(rowsol_);
  freeCacheDouble(redcost_);
  freeCacheDouble(rowact_);
  assert(colsol_ == NULL);
  assert(rowsol_ == NULL);
  assert(redcost_ == NULL);
  assert(rowact_ == NULL);
}

void OsiGrbSolverInterface::freeCachedData(int keepCached)
{
  if (!(keepCached & OsiGrbSolverInterface::KEEPCACHED_COLUMN))
    freeCachedColRim();
  if (!(keepCached & OsiGrbSolverInterface::KEEPCACHED_ROW))
    freeCachedRowRim();
  if (!(keepCached & OsiGrbSolverInterface::KEEPCACHED_MATRIX))
    freeCachedMatrix();
  if (!(keepCached & OsiGrbSolverInterface::KEEPCACHED_RESULTS))
    freeCachedResults();
}

void OsiGrbSolverInterface::freeAllMemory()
{
  freeCachedData();
  if (hotStartCStat_ != NULL)
    delete[] hotStartCStat_;
  if (hotStartRStat_ != NULL)
    delete[] hotStartRStat_;
  hotStartCStat_ = NULL;
  hotStartCStatSize_ = 0;
  hotStartRStat_ = NULL;
  hotStartRStatSize_ = 0;
  freeColSpace();
  delete[] auxcolind;
  auxcolind = NULL;
  auxcolindspace = 0;
  nauxcols = 0;
}

/// converts a normal row into a ranged row by adding an auxiliary variable
void OsiGrbSolverInterface::convertToRangedRow(int rowidx, double rhs, double range)
{
  debugMessage("OsiGrbSolverInterface::convertToRangedRow()\n");

  assert(rowidx >= 0);
  assert(rowidx < getNumRows());
  assert(rhs > -getInfinity());
  assert(rhs < getInfinity());
  assert(range > 0.0);
  assert(range < getInfinity());

  if (nauxcols == 0) { // row rowidx is the first ranged row
    assert(colmap_O2G == NULL);
    assert(colmap_G2O == NULL);

    assert(colspace_ >= getNumCols());

    auxcolspace = 1;
    colmap_G2O = new int[colspace_ + auxcolspace];
    CoinIotaN(colmap_G2O, colspace_ + auxcolspace, 0);

    colmap_O2G = CoinCopyOfArray(colmap_G2O, colspace_);
  } else {
    assert(colmap_O2G != NULL);
    assert(colmap_G2O != NULL);
    resizeAuxColSpace(nauxcols + 1);
  }

  resizeAuxColIndSpace();
  assert(auxcolind[rowidx] == -1); /* not a ranged row yet */

  GUROBI_CALL("convertToRangedRow", GRBupdatemodel(getMutableLpPtr()));

  double minusone = -1.0;
  GUROBI_CALL("convertToRangedRow", GRBaddvar(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_PROBLEM), 1, &rowidx, &minusone, 0.0, rhs - range, rhs, GRB_CONTINUOUS, NULL));

  auxcolind[rowidx] = getNumCols() + nauxcols - 1;
  colmap_G2O[auxcolind[rowidx]] = -rowidx - 1;

  ++nauxcols;

#ifndef NDEBUG
  if (nauxcols) {
    int nc = getNumCols();
    int nr = getNumRows();
    for (int i = 0; i < nc + nauxcols; ++i) {
      assert(i >= nc || colmap_G2O[colmap_O2G[i]] == i);
      assert(colmap_G2O[i] < 0 || colmap_O2G[colmap_G2O[i]] == i);
      assert(colmap_G2O[i] >= 0 || -colmap_G2O[i] - 1 < nr);
      assert(colmap_G2O[i] >= 0 || auxcolind[-colmap_G2O[i] - 1] == i);
    }
  }
#endif
}

/// converts a ranged row into a normal row by removing its auxiliary variable
void OsiGrbSolverInterface::convertToNormalRow(int rowidx, char sense, double rhs)
{
  debugMessage("OsiGrbSolverInterface::convertToNormalRow()\n");

  assert(rowidx >= 0);
  assert(rowidx < getNumRows());

  int auxvar = auxcolind[rowidx];

  assert(nauxcols);
  assert(auxvar >= 0);
  assert(colmap_G2O[auxvar] == -rowidx - 1);

  GUROBI_CALL("convertToNormalRow", GRBupdatemodel(getMutableLpPtr()));

  /* row rowidx should be an ordinary equality row with rhs == 0 now */
  GUROBI_CALL("convertToNormalRow", GRBdelvars(getLpPtr(OsiGrbSolverInterface::KEEPCACHED_ROW), 1, &auxcolind[rowidx]));

  auxcolind[rowidx] = -1;

  if (nauxcols > 1) {
    int nc = getNumCols();
    for (int i = auxvar; i < nc; ++i) {
      if (colmap_O2G[i] > auxvar)
        --colmap_O2G[i];
      colmap_G2O[i] = colmap_G2O[i + 1];
    }
    for (int i = nc; i < nc + nauxcols; ++i)
      colmap_G2O[i] = colmap_G2O[i + 1];

    int nr = getNumRows();
    for (int i = 0; i < nr; ++i)
      if (auxcolind[i] > auxvar)
        --auxcolind[i];
    --nauxcols;
  } else { // no ranged rows left
    delete[] colmap_O2G;
    delete[] colmap_G2O;
    delete[] auxcolind;
    auxcolspace = 0;
    auxcolindspace = 0;
    nauxcols = 0;
  }

  setRowType(rowidx, sense, rhs, 0.0);

#ifndef NDEBUG
  if (nauxcols) {
    int nc = getNumCols();
    int nr = getNumRows();
    for (int i = 0; i < nc + nauxcols; ++i) {
      assert(i >= nc || colmap_G2O[colmap_O2G[i]] == i);
      assert(colmap_G2O[i] < 0 || colmap_O2G[colmap_G2O[i]] == i);
      assert(colmap_G2O[i] >= 0 || -colmap_G2O[i] - 1 < nr);
      assert(colmap_G2O[i] >= 0 || auxcolind[-colmap_G2O[i] - 1] == i);
    }
  }
#endif
}

//#############################################################################
// Resets as if default constructor
void OsiGrbSolverInterface::reset()
{
  setInitialData(); // clear base class
  gutsOfDestructor();
}

/**********************************************************************/
/* Returns 1 if can just do getBInv etc
   2 if has all OsiSimplex methods
   and 0 if it has none */
int OsiGrbSolverInterface::canDoSimplexInterface() const
{
  return 0;
}

/**********************************************************************/
bool OsiGrbSolverInterface::basisIsAvailable() const
{
  if (getNumCols() == 0)
    return true;

  GUROBI_CALL("basisIsAvailable", GRBupdatemodel(getMutableLpPtr()));

  int status;
  GUROBI_CALL("basisIsAvailable", GRBgetintattr(getMutableLpPtr(), GRB_INT_ATTR_STATUS, &status));

  if (status == GRB_LOADED || status == GRB_INFEASIBLE || status == GRB_INF_OR_UNBD || status == GRB_UNBOUNDED)
    return false;

  int dum;
  return GRBgetintattrelement(getMutableLpPtr(), GRB_INT_ATTR_VBASIS, 0, &dum) == 0;
}

/* Osi return codes:
0: free  
1: basic  
2: upper 
3: lower
*/
void OsiGrbSolverInterface::getBasisStatus(int *cstat, int *rstat) const
{

  int numcols = getNumCols();
  int numrows = getNumRows();

  GUROBI_CALL("getBasisStatus", GRBupdatemodel(getMutableLpPtr()));

  if (nauxcols)
    GUROBI_CALL("getBasisStatus", GRBgetintattrlist(getMutableLpPtr(), GRB_INT_ATTR_VBASIS, numcols, colmap_O2G, cstat));
  else
    GUROBI_CALL("getBasisStatus", GRBgetintattrarray(getMutableLpPtr(), GRB_INT_ATTR_VBASIS, 0, numcols, cstat));

  for (int i = 0; i < numcols; ++i)
    switch (cstat[i]) {
    case GRB_BASIC:
      cstat[i] = 1;
      break;
    case GRB_NONBASIC_LOWER:
      cstat[i] = 3;
      break;
    case GRB_NONBASIC_UPPER:
      cstat[i] = 2;
      break;
    case GRB_SUPERBASIC:
      cstat[i] = 0;
      break;
    }

  GUROBI_CALL("getBasisStatus", GRBgetintattrarray(getMutableLpPtr(), GRB_INT_ATTR_CBASIS, 0, numrows, rstat));

  char sense;
  for (int i = 0; i < numrows; ++i) {
    if (nauxcols && auxcolind[i] >= 0) { /* if the row is a ranged row, then we take the basis status from the corresponding auxiliary column
	       is this correct??? */
      int auxcolstat;
      GUROBI_CALL("getBasisStatus", GRBgetintattrelement(getMutableLpPtr(), GRB_INT_ATTR_VBASIS, auxcolind[i], &auxcolstat));
      switch (auxcolstat) {
      case GRB_BASIC:
        rstat[i] = 1;
        break;
      case GRB_NONBASIC_LOWER:
        rstat[i] = 3;
        break;
      case GRB_NONBASIC_UPPER:
        rstat[i] = 2;
        break;
      case GRB_SUPERBASIC:
        rstat[i] = 0;
        break;
      }
    } else {
      switch (rstat[i]) {
      case GRB_SUPERBASIC:
        rstat[i] = 0;
        break;
      case GRB_BASIC:
        rstat[i] = 1;
        break;
      case GRB_NONBASIC_LOWER:
      case GRB_NONBASIC_UPPER:
        GUROBI_CALL("getBasisStatus", GRBgetcharattrelement(getMutableLpPtr(), GRB_CHAR_ATTR_SENSE, i, &sense));
        rstat[i] = (sense == '>' ? 2 : 3);
        break;
      }
    }
  }
}

/* vi: softtabstop=2 shiftwidth=2 expandtab tabstop=2
*/
